Which operating system uses hyperlinked icons and is the most popular operating system to date?

This article is about the smartphone OS by Apple. For its tablet counterpart, see iPadOS. For the router/switch OS by Cisco Systems, see Cisco IOS. For other uses, see IOS [disambiguation]. For the Greek island, see Ios.

iOS [formerly iPhone OS[10]] is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone; the term also included the versions running on iPads until iPadOS was introduced in 2019, as well as on the iPod Touch devices, which were discontinued in mid-2022.[11] It is the world's second-most widely installed mobile operating system, after Android. It is the basis for three other operating systems made by Apple: iPadOS, tvOS, and watchOS. It is proprietary software, although some parts of it are open source under the Apple Public Source License and other licenses.[12]

Commercial logo as used by Apple, since 2017

Screenshot

iOS 15 running on an iPhone 12 Pro

• ARMv8-A [iOS 7 and later]
• ARMv7-A [iPhone OS 3 – iOS 10.3.4]
• ARMv6 [iPhone OS 1 – iOS 4.2.1]

Unveiled in 2007 for the first-generation iPhone, iOS has since been extended to support other Apple devices such as the iPod Touch [September 2007] and the iPad [introduced: January 2010; availability: April 2010.] As of March 2018[update], Apple's App Store contains more than 2.1 million iOS applications, 1 million of which are native for iPads.[13] These mobile apps have collectively been downloaded more than 130 billion times.

Major versions of iOS are released annually. The current stable version, iOS 15, was released to the public on September 20, 2021.[14]

See also: iOS version history

First iOS logotype [2010–2013], using Myriad Pro Semibold font

Second iOS logotype [2013–2017], using Myriad Pro Light font

Third iOS logotype [2017–present], using San Francisco Semibold font

In 2005, when Steve Jobs began planning the iPhone, he had a choice to either "shrink the Mac, which would be an epic feat of engineering, or enlarge the iPod". Jobs favored the former approach but pitted the Macintosh and iPod teams, led by Scott Forstall and Tony Fadell, respectively, against each other in an internal competition, with Forstall winning by creating the iPhone OS. The decision enabled the success of the iPhone as a platform for third-party developers: using a well-known desktop operating system as its basis allowed the many third-party Mac developers to write software for the iPhone with minimal retraining. Forstall was also responsible for creating a software development kit for programmers to build iPhone apps, as well as an App Store within iTunes.[15][16]

The operating system was unveiled with the iPhone at the Macworld Conference & Expo on January 9, 2007, and released in June of that year.[17][18][19] At the time of its unveiling in January, Steve Jobs claimed: "iPhone runs OS X" and runs "desktop class applications",[20][21] but at the time of the iPhone's release, the operating system was renamed "iPhone OS".[22] Initially, third-party native applications were not supported. Jobs' reasoning was that developers could build web applications through the Safari web browser that "would behave like native apps on the iPhone".[23][24] In October 2007, Apple announced that a native Software Development Kit [SDK] was under development and that they planned to put it "in developers' hands in February".[25][26][27] On March 6, 2008, Apple held a press event, announcing the iPhone SDK.[28][29]

The iOS App Store was opened on July 10, 2008, with an initial 500 applications available.[30] This quickly grew to 3,000 in September 2008,[31] 15,000 in January 2009,[32] 50,000 in June 2009,[33] 100,000 in November 2009,[34][35] 250,000 in August 2010,[36][37] 650,000 in July 2012,[38] 1 million in October 2013,[39][40] 2 million in June 2016,[41][42][43] and 2.2 million in January 2017.[44][45] As of March 2016[update], 1 million apps are natively compatible with the iPad tablet computer.[46] These apps have collectively been downloaded more than 130 billion times.[41] App intelligence firm Sensor Tower estimated that the App Store would reach 5 million apps by 2020.[47]

In September 2007, Apple announced the iPod Touch, a redesigned iPod based on the iPhone form factor.[48] On January 27, 2010, Apple introduced their much-anticipated media tablet, the iPad, featuring a larger screen than the iPhone and iPod Touch, and designed for web browsing, media consumption, and reading, and offering multi-touch interaction with multimedia formats including newspapers, e-books, photos, videos, music, word processing documents, video games, and most existing iPhone apps using a 9.7-inch screen.[49][50][51] It also includes a mobile version of Safari for web browsing, as well as access to the App Store, iTunes Library, iBookstore, Contacts, and Notes. Content is downloadable via Wi-Fi and optional 3G service or synced through the user's computer.[52] AT&T was initially the sole U.S. provider of 3G wireless access for the iPad.[53]

In June 2010, Apple rebranded iPhone OS as "iOS".[54][55] The trademark "IOS" had been used by Cisco for over a decade for its operating system, IOS, used on its routers. To avoid any potential lawsuit, Apple licensed the "IOS" trademark from Cisco.[56]

The Apple Watch smartwatch was announced by Tim Cook on September 9, 2014, being introduced as a product with health and fitness-tracking.[57][58] It was released on April 24, 2015.[59][60][61] It uses watchOS as its operating system; watchOS is based on iOS, with new features created specially for the Apple Watch such as an activity tracking app.

On November 22, 2016, a five-second video file originally named "IMG_0942.MP4" started crashing iOS on an increasing count of devices, forcing users to reboot. It gained massive popularity through social media channels and messaging services.[62][63]

In October 2016, Apple opened its first iOS Developer Academy in Naples inside University of Naples Federico II's new campus.[64][65] The course is completely free, aimed at acquiring specific technical skills on the creation and management of applications for the Apple ecosystem platforms.[66] At the academy there are also issues of business administration [business planning and business management with a focus on digital opportunities] and there is a path dedicated to the design of graphical interfaces. Students have the opportunity to participate in the "Enterprise Track", an in-depth training experience on the entire life cycle of an app, from design to implementation, to security, troubleshooting, data storage and cloud usage.[67][68] As of 2020, the academy graduated almost a thousand students from all over the world, who have worked on 400 app ideas and have already published about 50 apps on the iOS App Store. In the 2018–2019 academic year, students from more than 30 countries arrived. 35 of these have been selected to attend the Worldwide Developer Conference, the annual Apple Developer Conference held annually in California in early June.[69][70]

On June 3, 2019, iPadOS, the branded version of iOS for iPad, was announced at the 2019 WWDC; it was launched on September 25, 2019.[71]

The iOS user interface is based upon direct manipulation, using multi-touch gestures such as swipe, tap, pinch, and reverse pinch. Interface control elements include sliders, switches, and buttons.[72] Internal accelerometers are used by some applications to respond to shaking the device [one common result is the undo command] or rotating it in three dimensions [one common result is switching between portrait and landscape mode]. Various accessibility described in § Accessibility functions enable users with vision and hearing disabilities to properly use iOS.[73]

iOS devices boot to the homescreen, the primary navigation and information "hub" on iOS devices, analogous to the desktop found on personal computers. iOS homescreens are typically made up of app icons and widgets; app icons launch the associated app, whereas widgets display live, auto-updating content, such as a weather forecast, the user's email inbox, or a news ticker directly on the homescreen.[74]

Along the top of the screen is a status bar, showing information about the device and its connectivity. The status bar itself contains two elements, the Control Center and the Notification Center. The Control Center can be "pulled" down from the top right of the notch, on the new iPhones, giving access to various toggles to manage the device more quickly without having to open the Settings. It is possible to manage brightness, volume, wireless connections, music player, etc.[75]

Instead, scrolling from the top left to the bottom will open the Notification Center, which in the latest versions of iOS is very similar to the lockscreen. It displays notifications in chronological order and groups them by application. From the notifications of some apps it is possible to interact directly, for example by replying a message directly from it. Notifications are sent in two modes, the important notifications that are displayed on the lock screen and signaled by a distinctive sound, accompanied by a warning banner and the app badge icon, and the secondary mode where they are displayed in the Notification Center, but they are not shown on the lock screen, nor are they indicated by warning banners, badge icons or sounds.[76][77]

On earlier iPhones with home button, screenshots can be created with the simultaneous press of the home and power buttons. In comparison to Android OS, which requires the buttons to be held down, a short press does suffice on iOS.[78] On the more recent iPhones which lack a physical home button, screenshots are captured using the volume-up and power buttons instead.[79]

The camera application used a skeuomorphic closing camera shutter animation prior to iOS 7. Since then, it uses a simple short blackout effect.[80] Notable additions over time include HDR photography and the option to save both normal and high dynamic range photographs simultaneously where the former prevents ghosting effects from moving objects [since iPhone 5, iOS 6], automatic HDR adjustment [iOS 7.1], "live photo" with short video bundled to each photo if enabled [iPhone 6s, iOS 9], and a digital zoom shortcut [iPhone 7 Plus, iOS 10].[81][82][83] Some camera settings such as video resolution and frame rate are not adjustable through the camera interface itself, but are outsourced to the system settings.[84]

A new feature in iOS 13 called "context menus" shows related actions when you touch and hold an item. When the context menu is displayed, the background is blurred.[85]

To choose from a few options, a selection control is used. Selectors can appear anchored at the bottom or in line with the content [called date selectors]. Date selectors take on the appearance of any other selection control, but with a column for day, month, and optionally year.

Alerts appear in the center of the screen, but there are also alerts that scroll up from the bottom of the screen [called "action panels"]. Destructive actions [such as eliminating any element] are colored red.

The official font of iOS is San Francisco. It is designed for small text readability, and is used throughout the operating system, including third-party apps.[85]

The icons are 180x180px in size for iPhones with a larger screen, usually models over 6 inches, including iPhone 11 Pro and iPhone 8 Plus, while it's 120x120px on iPhones with smaller displays.[86]

Applications

See also: App Store [iOS] and .ipa

iOS devices come with preinstalled apps developed by Apple including Mail, Maps, TV, Music, FaceTime, Wallet, Health, and many more.

Applications ["apps"] are the most general form of application software that can be installed on iOS. They are downloaded from the official catalog of the App Store digital store, where apps are subjected to security checks before being made available to users. In June 2017, Apple updated its guidelines to specify that app developers will no longer have the ability to use custom prompts for encouraging users to leave reviews for their apps.[87][88] IOS applications can also be installed directly from an IPA file provided by the software distributor, via unofficial ways. They are written using iOS Software Development Kit [SDK] and, often, combined with Xcode, using officially supported programming languages, including Swift and Objective-C. Other companies have also created tools that allow for the development of native iOS apps using their respective programming languages.

Applications for iOS are mostly built using components of UIKit, a programming framework. It allows applications to have a consistent look and feel with the OS, nevertheless offering customization.

Elements automatically update along with iOS updates, automatically including new interface rules. UIKit elements are very adaptable, this allows developers to design a single app that looks the same on any iOS device. In addition to defining the iOS interface, UIKit defines the functionality of the application.

At first, Apple did not intend to release an SDK to developers, because they did not want third-party apps to be developed for iOS, building web apps instead. However, this technology never entered into common use, this led Apple to change its opinion, so in October 2007 the SDK for developers was announced, finally released on March 6, 2008.

The SDK includes an inclusive set of development tools,[89] including an audio mixer and an iPhone simulator. It is a free download for Mac users. It is not available for Microsoft Windows PCs. To test the application, get technical support, and distribute applications through App Store, developers are required to subscribe to the Apple Developer Program.

Over the years, the Apple Store apps surpassed multiple major milestones, including 50,000,[90] 100,000,[91] 250,000,[92] 500,000,[93] 1 million,[94] and 2 million apps.[95] The billionth application was installed on April 24, 2009.[96]

Home screen

Main article: SpringBoard

The home screen, rendered by SpringBoard, displays application icons and a dock at the bottom where users can pin their most frequently used apps. The home screen appears whenever the user unlocks the device or presses the physical "Home" button while in another app.[97] Before iOS 4 on the iPhone 3GS [or later], the screen's background could be customized only through jailbreaking, but can now be changed out-of-the-box. The screen has a status bar across the top to display data, such as time, battery level, and signal strength. The rest of the screen is devoted to the current application. When a passcode is set and a user switches on the device, the passcode must be entered at the Lock Screen before access to the Home screen is granted.[98]

In iPhone OS 3, Spotlight was introduced, allowing users to search media, apps, emails, contacts, messages, reminders, calendar events, and similar content. In iOS 7 and later, Spotlight is accessed by pulling down anywhere on the home screen [except for the top and bottom edges that open Notification Center and Control Center].[99][100] In iOS 9, there are two ways to access Spotlight. As with iOS 7 and 8, pulling down on any homescreen will show Spotlight. However, it can also be accessed as it was in iOS versions 3 through 6. This endows Spotlight with Siri suggestions, which include app suggestions, contact suggestions and news.[101] In iOS 10, Spotlight is at the top of the now-dedicated "Today" panel.[102]

Since iOS 3.2, users are able to set a background image for the Home Screen. This feature is only available on third-generation devices—iPhone 3GS, third-generation iPod Touch [iOS 4.0 or newer], and all iPad models [since iOS 3.2]—or newer.

iOS 7 introduced a parallax effect on the Home Screen, which shifts the device's wallpaper and icons in response to the movement of the device, creating a 3D effect and an illusion of floating icons. This effect is also visible in the tab view of Mail and Safari.[103]

Researchers found that users organize icons on their homescreens based on usage frequency and relatedness of the applications, as well as for reasons of usability and aesthetics.[104]

System font

iOS originally used Helvetica as the system font. Apple switched to Helvetica Neue exclusively for the iPhone 4 and its Retina Display, and retained Helvetica as the system font for older iPhone devices on iOS 4.[105] With iOS 7, Apple announced that they would change the system font to Helvetica Neue Light, a decision that sparked criticism for inappropriate usage of a light, thin typeface for low-resolution mobile screens. Apple eventually chose Helvetica Neue instead.[106][107] The release of iOS 7 also introduced the ability to scale text or apply other forms of text accessibility changes through Settings.[108][109] With iOS 9, Apple changed the font to San Francisco, an Apple-designed font aimed at maximum legibility and font consistency across its product lineup.[110][111]

Folders

iOS 4 introduced folders, which can be created by dragging an application on top of another, and from then on, more items can be added to the folder using the same procedure. A title for the folder is automatically selected by the category of applications inside, but the name can also be edited by the user.[112] When apps inside folders receive notification badges, the individual numbers of notifications are added up and the total number is displayed as a notification badge on the folder itself.[112] Originally, folders on an iPhone could include up to 12 apps, while folders on iPad could include 20.[113] With increasing display sizes on newer iPhone hardware, iOS 7 updated the folders with pages similar to the home screen layout, allowing for a significant expansion of folder functionality. Each page of a folder can contain up to nine apps, and there can be 15 pages in total, allowing for a total of 135 apps in a single folder.[114] In iOS 9, Apple updated folder sizes for iPad hardware, allowing for 16 apps per page, still at 15 pages maximum, increasing the total to 240 apps.[115]

Notification Center

Main article: Notification Center

Before iOS 5, notifications were delivered in a modal window and couldn't be viewed after being dismissed. In iOS 5, Apple introduced Notification Center, which allows users to view a history of notifications. The user can tap a notification to open its corresponding app, or clear it.[116] Notifications are now delivered in banners that appear briefly at the top of the screen. If a user taps a received notification, the application that sent the notification will be opened. Users can also choose to view notifications in modal alert windows by adjusting the application's notification settings. Introduced with iOS 8, widgets are now accessible through the Notification Center, defined by 3rd parties.

When an app sends a notification while closed, a red badge appears on its icon. This badge tells the user, at a glance, how many notifications that app has sent. Opening the app clears the badge.

Accessibility

iOS offers various accessibility features to help users with vision and hearing disabilities. One major feature, VoiceOver, provides a voice reading information on the screen, including contextual buttons, icons, links and other user interface elements, and allows the user to navigate the operating system through gestures. Any apps with default controls and developed with a UIKit framework gets VoiceOver functionality built in.[117] One example includes holding up the iPhone to take a photo, with VoiceOver describing the photo scenery.[118] As part of a "Made for iPhone" program, introduced with the release of iOS 7 in 2013, Apple has developed technology to use Bluetooth and a special technology protocol to let compatible third-party equipment connect with iPhones and iPads for streaming audio directly to a user's ears. Additional customization available for Made for iPhone products include battery tracking and adjustable sound settings for different environments.[119][120] Apple made further efforts for accessibility for the release of iOS 10 in 2016, adding a new pronunciation editor to VoiceOver, adding a Magnifier setting to enlarge objects through the device's camera, software TTY support for deaf people to make phone calls from the iPhone, and giving tutorials and guidelines for third-party developers to incorporate proper accessibility functions into their apps.[121]

In 2012, Liat Kornowski from The Atlantic wrote that "the iPhone has turned out to be one of the most revolutionary developments since the invention of Braille",[122] and in 2016, Steven Aquino of TechCrunch described Apple as "leading the way in assistive technology", with Sarah Herrlinger, Senior Manager for Global Accessibility Policy and Initiatives at Apple, stating that "We see accessibility as a basic human right. Building into the core of our products supports a vision of an inclusive world where opportunity and access to information are barrier-free, empowering individuals with disabilities to achieve their goals".[123]

Criticism has been aimed at iOS depending on both internet connection [either WiFi or through iTunes] and a working SIM card upon first activation.[124] This restriction has been loosened in iOS 12, which no longer requires the latter.[125]

Multitasking

Multitasking for iOS was first released in June 2010 along with the release of iOS 4.[126][127] Only certain devices—iPhone 4, iPhone 3GS, and iPod Touch 3rd generation—were able to multitask.[128] The iPad did not get multitasking until iOS 4.2.1 in that November.[129]

The implementation of multitasking in iOS has been criticized for its approach, which limits the work that applications in the background can perform to a limited function set and requires application developers to add explicit support for it.[128][130]

Before iOS 4, multitasking was limited to a selection of the applications Apple included on the device. Users could however "jailbreak" their device in order to unofficially multitask.[131] Starting with iOS 4, on third-generation and newer iOS devices, multitasking is supported through seven background APIs:[132]

1. Background audio – application continues to run in the background as long as it is playing audio or video content[133]
2. Voice over IP – application is suspended when a phone call is not in progress[133]
3. Background location – application is notified of location changes[133]
4. Push notifications
5. Local notifications – application schedules local notifications to be delivered at a predetermined time[133]
6. Task completion – application asks the system for extra time to complete a given task[133]
7. Fast app switching – application does not execute any code and may be removed from memory at any time[133]

In iOS 5, three new background APIs were introduced:

1. Newsstand – application can download content in the background to be ready for the user[133]
2. External Accessory – application communicates with an external accessory and shares data at regular intervals[133]
3. Bluetooth Accessory – application communicates with a bluetooth accessory and shares data at regular intervals[133]

In iOS 7, Apple introduced a new multitasking feature, providing all apps with the ability to perform background updates. This feature prefers to update the user's most frequently used apps and prefers to use Wi-Fi networks over a cellular network, without markedly reducing the device's battery life.

Switching applications

In iOS 4.0 to iOS 6.x, double-clicking the home button activates the application switcher. A scrollable dock-style interface appears from the bottom, moving the contents of the screen up. Choosing an icon switches to an application. To the far left are icons which function as music controls, a rotation lock, and on iOS 4.2 and above, a volume controller.

With the introduction of iOS 7, double-clicking the home button also activates the application switcher. However, unlike previous versions it displays screenshots of open applications on top of the icon and horizontal scrolling allows for browsing through previous apps, and it is possible to close applications by dragging them up, similar to how WebOS handled multiple cards.[134]

With the introduction of iOS 9, the application switcher received a significant visual change; while still retaining the card metaphor introduced in iOS 7, the application icon is smaller, and appears above the screenshot [which is now larger, due to the removal of "Recent and Favorite Contacts"], and each application "card" overlaps the other, forming a rolodex effect as the user scrolls. Now, instead of the home screen appearing at the leftmost of the application switcher, it appears rightmost.[135] In iOS 11, the application switcher receives a major redesign. In the iPad, the Control Center and app switcher are combined. The app switcher in the iPad can also be accessed by swiping up from the bottom. In the iPhone, the app switcher cannot be accessed if there are no apps in the RAM.

Ending tasks

In iOS 4.0 to iOS 6.x, briefly holding the icons in the application switcher makes them "jiggle" [similarly to the homescreen] and allows the user to force quit the applications by tapping the red minus circle that appears at the corner of the app's icon.[136] Clearing applications from multitasking stayed the same from iOS 4.0 through 6.1.6, the last version of iOS 6.

As of iOS 7, the process has become faster and easier. In iOS 7, instead of holding the icons to close them, they are closed by simply swiping them upwards off the screen. Up to three apps can be cleared at a time compared to one in versions up to iOS 6.1.6.[137]

Task completion

Task completion allows apps to continue a certain task after the app has been suspended.[138][139] As of iOS 4.0, apps can request up to ten minutes to complete a task in the background.[140] This doesn't extend to background uploads and downloads though [e.g. if a user starts a download in one application, it won't finish if they switch away from the application].

Siri

Main article: Siri

Siri [/ˈsɪri/] is an intelligent personal assistant integrated into iOS. The assistant uses voice queries and a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services. The software adapts to users' individual language usages, searches, and preferences, with continuing use. Returned results are individualized.

Originally released as an app for iOS in February 2010,[141] it was acquired by Apple two months later,[142][143][144] and then integrated into iPhone 4S at its release in October 2011.[145][146] At that time, the separate app was also removed from the iOS App Store.[147]

Siri supports a wide range of user commands, including performing phone actions, checking basic information, scheduling events and reminders, handling device settings, searching the Internet, navigating areas, finding information on entertainment, and is able to engage with iOS-integrated apps.[148] With the release of iOS 10 in 2016, Apple opened up limited third-party access to Siri, including third-party messaging apps, as well as payments, ride-sharing, and Internet calling apps.[149][150] With the release of iOS 11, Apple updated Siri's voices for more clear, human voices, it now supports follow-up questions and language translation, and additional third-party actions.[151][152]

Game Center

Main article: Game Center

Game Center is an online multiplayer "social gaming network"[153] released by Apple.[154] It allows users to "invite friends to play a game, start a multiplayer game through matchmaking, track their achievements, and compare their high scores on a leaderboard." iOS 5 and above adds support for profile photos.[153]

Game Center was announced during an iOS 4 preview event hosted by Apple on April 8, 2010. A preview was released to registered Apple developers in August.[153] It was released on September 8, 2010, with iOS 4.1 on iPhone 4, iPhone 3GS, and iPod Touch 2nd generation through 4th generation.[155] Game Center made its public debut on the iPad with iOS 4.2.1.[156] There is no support for the iPhone 3G, original iPhone and the first-generation iPod Touch [the latter two devices did not have Game Center because they did not get iOS 4].[157] However, Game Center is unofficially available on the iPhone 3G via a hack.[158]

The main hardware platform for iOS is the ARM architecture [the ARMv7, ARMv8-A, ARMv8.2-A, ARMv8.3-A]. iOS releases before iOS 7 can only be run on iOS devices with 32-bit ARM processors [ARMv6 and ARMv7-A architectures]. In 2013, iOS 7 was released with full 64-bit support [which includes a native 64-bit kernel, libraries, drivers as well as all built-in applications],[159] after Apple announced that they were switching to 64-bit ARMv8-A processors with the introduction of the Apple A7 chip.[160] 64-bit support was also enforced for all apps in the App Store; All new apps submitted to the App Store with a deadline of February 2015, and all app updates submitted to the App Store with a deadline of June 1, 2015.[161] iOS 11 drops support for all iOS devices with 32-bit ARM processors as well as 32-bit applications,[162][163] making iOS 64-bit only.[164]

iOS has support for many locales.

Notes

1. The iPod Touch at its launch supported English, French, German, Japanese, Dutch, Italian, Spanish, Portuguese, Danish, Finnish, Norwegian, Swedish, Korean, Simplified Chinese, Traditional Chinese, Russian, and Polish. However, most of these languages were not available in the iPhone until iPhone 2.0.
2. As of iOS 8, users can add more than one locale to use on the device. If one language is not supported, the next one is used instead. The language on the top of the list is the primary one.
3. While these regions are present in iOS 8, they fall back to the generic regions for the system language. This issue has been resolved in iOS 9 and later, when a default region is added.
   • de-AT, de-CH: de
   • en-CA, en-US: en
   • es-ES: es
   • es-419: es-MX
   • fr-CH: fr
4. iOS 9 and above improved the locale handling process, now applying a default region to those that have multiple regions. The region is not displayed in the locale name if the region is the same as the country/region setting, or if only one region is added for a language.
   • German: German [Germany]
   • English: English [US]
   • Spanish: Spanish [Spain]
   • French: French [France]
   • Italian: Italian [Italy]
   • Dutch: Dutch [Netherlands]
   • Portuguese: Portuguese [Brazil]
   • Chinese, Traditional: Chinese, Traditional [Taiwan]
5. Dutch [Belgium] was previously shown as Flemish in iOS 9 before being fixed in iOS 10, to bring it more in line with other locales.
6. iOS 10 and macOS Sierra were the last versions in which new locales were added for the languages supported by iOS and macOS.
   • English [US]: United States, Canada
   • English [UK]: United Kingdom, Ireland, Singapore, South Africa
   • English [Australia]: Australia, New Zealand
   • English [India]: India
   • Chinese, Simplified: China mainland
   • Chinese, Traditional [Taiwan]: Taiwan
   • Chinese, Traditional [Hong Kong]: Hong Kong, Macau
   • Japanese: Japan
   • Spanish [Spain]: Spain
   • Spanish [Latin America]: Latin America, Argentina, Bolivia, Chile, Colombia, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, Uruguay, US, Venezuela
   • French [France]: France, Belgium, Switzerland
   • French [Canada]: Canada
   • German: Germany, Austria, Switzerland
   • Russian: Russia
   • Portuguese [Brazil]: Brazil
   • Portuguese [Portugal]: Portugal
   • Italian: Italy, Switzerland
   • Korean: South Korea
   • Turkish: Turkey
   • Dutch: Netherlands, Belgium
   • Arabic: Saudi Arabia
   • Thai: Thailand
   • Swedish: Sweden
   • Danish: Denmark
   • Vietnamese: Vietnam
   • Norwegian Bokmål: Norway
   • Polish: Poland
   • Finnish: Finland
   • Indonesian: Indonesia
   • Hebrew: Israel
   • Greek: Greece
   • Romanian: Romania
   • Hungarian: Hungary
   • Czech: Czechia
   • Catalan: Spain
   • Slovak: Slovakia
   • Ukrainian: Ukraine
   • Croatian: Croatia
   • Malay: Malaysia
   • Hindi: India
7. It is possible to add custom locales in the iOS Simulator by editing the AppleLanguages portion of the .GlobalPreferences.plist file for each simulator.

Main article: iOS SDK

The iOS SDK [Software Development Kit] allows for the development of mobile apps on iOS.

While originally developing iPhone prior to its unveiling in 2007, Apple's then-CEO Steve Jobs did not intend to let third-party developers build native apps for iOS, instead directing them to make web applications for the Safari web browser.[165] However, backlash from developers prompted the company to reconsider,[165] with Jobs announcing in October 2007 that Apple would have a software development kit available for developers by February 2008.[166][167] The SDK was released on March 6, 2008.[168][169]

The SDK is a free download for users of Mac personal computers.[170] It is not available for Microsoft Windows PCs.[170] The SDK contains sets giving developers access to various functions and services of iOS devices, such as hardware and software attributes.[171] It also contains an iPhone simulator to mimic the look and feel of the device on the computer while developing.[171] New versions of the SDK accompany new versions of iOS.[172][173] In order to test applications, get technical support, and distribute apps through App Store, developers are required to subscribe to the Apple Developer Program.[170]

Combined with Xcode, the iOS SDK helps developers write iOS apps using officially supported programming languages, including Swift and Objective-C.[174] Other companies have also created tools that allow for the development of native iOS apps using their respective programming languages.[175][176]

Update schedule

Main article: iOS version history

Platform usage as measured by the App Store on May 31th, 2022[177]

  iOS 15 [82.00%]

  iOS 14 [14.00%]

  iOS 13 and earlier [4.00%]

Apple provides major updates to the iOS operating system annually via iTunes and, since iOS 5, also over-the-air.[178] The device checks an XML-based PLIST file on mesu.apple.com for updates. Updates are delivered as unencrypted ZIP files. On all except the earlier iOS devices, update availability is checked regularly, and the user prompted to permit automatic installation.

Stable version iOS 15 was released on September 20, 2021, available for iPhone 6S and later, and the seventh-generation iPod Touch.[179] iPadOS 15 was also released. Apple introduced iOS 15 and iPadOS 15 at its annual WWDC keynote conference on June 22, 2020.[180] iPadOS 15 is available on the same devices as iOS 14. Devices supported are iPad Air 2 and later, iPad fifth-generation and later, iPad Mini 4 and later and all versions of the iPad Pro.[181] The update introduced new features including redesigned notifications, a more informative Weather app, Focus Mode, SharePlay, and Live Text OCR.[182]

iPod Touch users originally had to pay for system software updates due to accounting rules that designated it not a "subscription device" like iPhone or Apple TV,[183][184] causing iPod Touch owners not to update.[185] In September 2009, a change in accounting rules won tentative approval, affecting Apple's earnings and stock price, and allowing iPod Touch updates to be delivered free of charge.[186][187]

Apple significantly extended the cycle of updates for iOS-supported devices over the years. The iPhone [1st generation] and iPhone 3G only received two iOS updates, while later models had support for five, six, and seven years.[188][189]

XNU kernel

The iOS kernel is the XNU kernel of Darwin. The original iPhone OS [1.0] up to iPhone OS 3.1.3 used Darwin 9.0.0d1. iOS 4 was based on Darwin 10. iOS 5 was based on Darwin 11. iOS 6 was based on Darwin 13. iOS 7 and iOS 8 are based on Darwin 14. iOS 9 is based on Darwin 15. iOS 10 is based on Darwin 16. iOS 11 is based on Darwin 17. iOS 12 is based on Darwin 18. iOS 13 is based on Darwin 19.[190]

In iOS 6 the kernel is subject to ASLR, similar to that of OS X Mountain Lion. This makes exploit possibilities more complex since it is not possible to know the location of kernel code.

Since XNU is based on the BSD kernel, it is open source.[191] The source is under a 3-clause[192] BSD license for the original BSD parts, with parts added by Apple under the Apple Public Source License.[193] The versions contained in iOS are not available; only the versions used in macOS are available.

iOS does not have kernel extensions [kexts] in the file system, even if they are actually present. The kernel cache can be decompressed to show the correct kernel, along with the kexts [all packed in the __PRELINK_TEXT section] and their plists [in the __PRELINK_INFO section].

The kernel cache can also be directly decompressed [if decrypted] using third-party tools. With the advent of iOS 10 betas and default plain text kernelcaches, these tools can only be used after unpacking and applying lzssdec to unpack the kernel cache to its full size.

The kextstat provided by the Cydia alternative software does not work on iOS because the kextstat is based on kmod_get_info[...], which is a deprecated API in iOS 4 and Mac OS X Snow Leopard. There are other alternative software that can also dump raw XML data.

On developing devices, the kernel is always stored as a statically linked cache stored in /System/Library/Caches/com.apple.kernelcaches/kernelcache which is unpacked and executed at boot.

In the beginning, iOS had a kernel version usually higher than the corresponding version of macOS. Over time, the kernels of iOS and macOS have gotten closer. This is not surprising, considering that iOS introduced new features [such as the ASLR Kernel, the default freezer, and various security-strengthening features] that were first incorporated and subsequently arrived on macOS. It appears Apple is gradually merging the iOS and macOS kernels over time. The build date for each version varies slightly between processors. This is due to the fact that the builds are sequential.

The latest version of the Darwin Kernel updated to iOS 13.6 is 19.6.0, dated July 27, 2020, while for iOS 14 beta 4 it is 20.0.0, dated July 27, 2020.

Kernel Image

The kernel image base is randomized by the boot loader [iBoot]. This is done by creating random data, doing a SHA-1 hash of it and then using a byte from the SHA-1 hash for the kernel slide. The slide is calculated with this formula:

If the slide is 0, the static offset of 0x21000000 is used instead.

The adjusted base is passed to the kernel in the boot arguments structure at offset 0x04, which is equivalent to gBootArgs->virtBase.

Kernel Map

The kernel map is used for kernel allocations of all types [kalloc[], kernel_memory_allocate[], etc.] and spans all of kernel space [0x80000000-0xFFFEFFFF]. The kernel based maps are submaps of the kernel_map, for example zone_map, ipc_kernel_map, etc.

The strategy is to randomize the base of the kernel_map. A random 9-bit value is generated right after kmem_init[] which establishes kernel_map, is multiplied by the page size. The resulting value is used as the size for the initial kernel_map allocation. Future kernel_map [and submap] allocations are pushed forward by a random amount. The allocation is silently removed after the first garbage collection and reused. This behaviour can be overridden with the "kmapoff" boot parameter.

Attacks

Kext_request[] allows applications to request information about kernel modules, divided into active and passive operations. Active operations [load, unload, start, stop, etc.] require root access. iOS removes the ability to load kernel extensions. Passive operations were originally [before iOS 6] unrestricted and allowed unprivileged users to query kernel module base addresses. iOS6 inadvertently removed some limitations; only the load address requests are disallowed. So attackers can use kKextRequestPredicateGetLoaded to get load addresses and mach-o header dumps. The load address and mach-o segment headers are obscured to hide the ASLR slide, but mach-o section headers are not. This reveals the virtual addresses of loaded kernel sections.

This information leak has been closed with iOS 6.0.1.

Versions codenames

Main article: List of Apple codenames § iOS

Internally, iOS identifies each version by a codename, often used internally only, normally to maintain secrecy of the project. For example, the codename for iOS 14 is Azul.

Jailbreaking

Main article: iOS jailbreaking

Since its initial release, iOS has been subject to a variety of different hacks centered around adding functionality not allowed by Apple.[194] Prior to the 2008 debut of Apple's native iOS App Store, the primary motive for jailbreaking was to bypass Apple's purchase mechanism for installing the App Store's native applications.[195] Apple claimed that it would not release iOS software updates designed specifically to break these tools [other than applications that perform SIM unlocking]; however, with each subsequent iOS update, previously un-patched jailbreak exploits are usually patched.[196]

When a device is booting, it loads Apple's own kernel initially, so a jailbroken device must be exploited and have the kernel patched each time it is booted up.

There are different types of jailbreak. An untethered jailbreak uses exploits that are powerful enough to allow the user to turn their device off and back on at will, with the device starting up completely, and the kernel will be patched without the help of a computer – in other words, it will be jailbroken even after each reboot.

However, some jailbreaks are tethered. A tethered jailbreak is only able to temporarily jailbreak the device during a single boot. If the user turns the device off and then boots it back up without the help of a jailbreak tool, the device will no longer be running a patched kernel, and it may get stuck in a partially started state, such as Recovery Mode. In order for the device to start completely and with a patched kernel, it must be "re-jailbroken" with a computer [using the "boot tethered" feature of a tool] each time it is turned on. All changes to the files on the device [such as installed package files or edited system files] will persist between reboots, including changes that can only function if the device is jailbroken [such as installed package files].

In more recent years, two other solutions have been created – semi-tethered and semi-untethered.

A semi-tethered solution is one where the device is able to start up on its own, but it will no longer have a patched kernel, and therefore will not be able to run modified code. It will, however, still be usable for normal functions, just like stock iOS. To start with a patched kernel, the user must start the device with the help of the jailbreak tool.

A semi-untethered jailbreak gives the ability to start the device on its own. On first boot, the device will not be running a patched kernel. However, rather than having to run a tool from a computer to apply the kernel patches, the user is able to re-jailbreak their device with the help of an app [usually sideloaded using Cydia Impactor] running on their device. In the case of the iOS 9.2-9.3.3 jailbreak, a Safari-based exploit was available, thereby meaning a website could be used to rejailbreak.

In more detail: Each iOS device has a bootchain that tries to make sure only trusted/signed code is loaded. A device with a tethered jailbreak is able to boot up with the help of a jailbreaking tool because the tool executes exploits via USB that bypass parts of that "chain of trust", bootstrapping to a pwned [no signature check] iBSS, iBEC, or iBoot to finish the boot process.

Since the arrival of Apple's native iOS App Store, and—along with it—third-party applications, the general motives for jailbreaking have changed.[197] People jailbreak for many different reasons, including gaining filesystem access, installing custom device themes, and modifying SpringBoard. An additional motivation is that it may enable the installation of pirated apps. On some devices, jailbreaking also makes it possible to install alternative operating systems, such as Android and the Linux kernel. Primarily, users jailbreak their devices because of the limitations of iOS. Depending on the method used, the effects of jailbreaking may be permanent or temporary.[198]

In 2010, the Electronic Frontier Foundation [EFF] successfully convinced the U.S. Copyright Office to allow an exemption to the general prohibition on circumvention of copyright protection systems under the Digital Millennium Copyright Act [DMCA]. The exemption allows jailbreaking of iPhones for the sole purpose of allowing legally obtained applications to be added to the iPhone.[199] The exemption does not affect the contractual relations between Apple and an iPhone owner, for example, jailbreaking voiding the iPhone warranty; however, it is solely based on Apple's discretion on whether they will fix jailbroken devices in the event that they need to be repaired. At the same time, the Copyright Office exempted unlocking an iPhone from DMCA's anticircumvention prohibitions.[200] Unlocking an iPhone allows the iPhone to be used with any wireless carrier using the same GSM or CDMA technology for which the particular phone model was designed to operate.[201]

Unlocking

Main article: SIM lock

Initially most wireless carriers in the US did not allow iPhone owners to unlock it for use with other carriers. However AT&T allowed iPhone owners who had satisfied contract requirements to unlock their iPhone.[202] Instructions to unlock the device are available from Apple,[203] but it is ultimately at the sole discretion of the carrier to authorize unlocking the device.[204] This allows the use of a carrier-sourced iPhone on other networks. Modern versions of iOS and the iPhone fully support LTE across multiple carriers wherever the phone was purchased.[205] Programs to remove SIM lock restrictions are available, but are not supported by Apple, and most often not a permanent unlock – a soft unlock,[206] which modifies the iPhone so that the baseband will accept the SIM card of any GSM carrier. SIM unlocking is not jailbreaking, but a jailbreak is also required for these unofficial software unlocks.

The legality of software unlocking varies in each country; for example, in the US, there is a DMCA exemption for unofficial software unlocking of devices purchased before January 26, 2013.[207]

The closed and proprietary nature of iOS has garnered criticism, particularly by digital rights advocates such as the Electronic Frontier Foundation, computer engineer and activist Brewster Kahle, Internet-law specialist Jonathan Zittrain, and the Free Software Foundation who protested the iPad's introductory event and have targeted the iPad with their "Defective by Design" campaign.[208][209][210][211] Competitor Microsoft, via a PR spokesman, criticized Apple's control over its platform.[212]

At issue are restrictions imposed by the design of iOS, namely digital rights management [DRM] intended to lock purchased media to Apple's platform, the development model [requiring a yearly subscription to distribute apps developed for the iOS], the centralized approval process for apps, as well as Apple's general control and lockdown of the platform itself. Particularly at issue is the ability for Apple to remotely disable or delete apps at will.

Some in the tech community have expressed concern that the locked-down iOS represents a growing trend in Apple's approach to computing, particularly Apple's shift away from machines that hobbyists can "tinker with" and note the potential for such restrictions to stifle software innovation.[213][214] Former Facebook developer Joe Hewitt protested against Apple's control over its hardware as a "horrible precedent" but praised iOS's sandboxing of apps.[215]

See also: Mobile security and WARRIOR PRIDE

iOS utilizes many security features in both hardware and software. Below are summaries of the most prominent features.

Secure Boot

Before fully booting into iOS, there is low-level code that runs from the Boot ROM. Its task is to verify that the Low-Level Bootloader is signed by the Apple Root CA public key before running it. This process is to ensure that no malicious or otherwise unauthorized software can be run on an iOS device. After the Low-Level Bootloader finishes its tasks, it runs the higher level bootloader, known as iBoot. If all goes well, iBoot will then proceed to load the iOS kernel as well as the rest of the operating system.[216]

Secure Enclave

The Secure Enclave is a coprocessor found in iOS devices part of the A7 and newer chips used for data protection, Touch ID and Face ID. The purpose of the Secure Enclave is to handle keys and other info such as biometrics that is sensitive enough to not be handled by the Application Processor [AP]. It is isolated with a hardware filter so the AP cannot access it. It shares RAM with the AP, but its portion of the RAM [known as TZ0] is encrypted. The secure enclave itself is a flashable 4 MB AKF processor core called the secure enclave processor [SEP] as documented in Apple Patent Application 20130308838. The technology used is similar to ARM's TrustZone/SecurCore but contains proprietary code for Apple KF cores in general and SEP specifically. It is also responsible for generating the UID key on A9 or newer chips that protects user data at rest.[citation needed]

It has its own secure boot process to ensure that it is completely secure. A hardware random number generator is also included as a part of this coprocessor. Each device's Secure Enclave has a unique ID that is given to it when it is made and cannot be changed. This identifier is used to create a temporary key that encrypts the memory in this portion of the system. The Secure Enclave also contains an anti-replay counter to prevent brute force attacks.[216]

The SEP is located in the devicetree under IODeviceTree:/arm-io/sep and managed by the AppleSEPManager driver.[217]

In 2020, security flaws in the SEP were discovered, causing concerns about Apple devices such as iPhones.[218]

Face ID

Main article: Face ID

Face ID is a face scanner that is embedded in the notch on iPhone models X, XS, XS Max, XR, 11, 11 Pro, 11 Pro Max, 12, 12 Mini, 12 Pro, and 12 Pro Max, and 13, 13 Mini, 13 Pro, and 13 Pro Max. It can be used to unlock the device, make purchases, and log into applications among other functions. When used, Face ID only temporarily stores the face data in encrypted memory in the Secure Enclave, as described above. There is no way for the device's main processor or any other part of the system to access the raw data that is obtained from the Face ID sensor.[216]

Passcode

iOS devices can have a passcode that is used to unlock the device, make changes to system settings, and encrypt the device's contents. Until recently, these were typically four numerical digits long. However, since unlocking the devices with a fingerprint by using Touch ID has become more widespread, six-digit passcodes are now the default on iOS with the option to switch back to four or use an alphanumeric passcode.[216]

Touch ID

Main article: Touch ID

Touch ID is a fingerprint scanner that is embedded in the home button and can be used to unlock the device, make purchases, and log into applications among other functions. When used, Touch ID only temporarily stores the fingerprint data in encrypted memory in the Secure Enclave, as described above. There is no way for the device's main processor or any other part of the system to access the raw fingerprint data that is obtained from the Touch ID sensor.[216]

Address Space Layout Randomization

Main article: Address Space Layout Randomization

Address Space Layout Randomization [ASLR] is a low-level technique of preventing memory corruption attacks such as buffer overflows. It involves placing data in randomly selected locations in memory in order to make it more difficult to predict ways to corrupt the system and create exploits. ASLR makes app bugs more likely to crash the app than to silently overwrite memory, regardless of whether the behavior is accidental or malicious.[219]

Non-executable memory

iOS utilizes the ARM architecture's Execute Never [XN] feature. This allows some portions of the memory to be marked as non-executable, working alongside ASLR to prevent buffer overflow attacks including return-to-libc attacks.[216]

Encryption

As mentioned above, one use of encryption in iOS is in the memory of the Secure Enclave. When a passcode is utilized on an iOS device, the contents of the device are encrypted. This is done by using a hardware AES 256 implementation that is very efficient because it is placed directly between the flash storage and RAM.[216]

iOS, in combination with its specific hardware, uses crypto-shredding when erasing all content and settings by obliterating all the keys in 'effaceable storage'. This renders all user data on the device cryptographically inaccessible.[220]

Keychain

The iOS keychain is a database of login information that can be shared across apps written by the same person or organization.[216] This service is often used for storing passwords for web applications.[221]

App security

Third-party applications such as those distributed through the App Store must be code signed with an Apple-issued certificate. In principle, this continues the chain of trust all the way from the Secure Boot process as mentioned above to the actions of the applications installed on the device by users. Applications are also sandboxed, meaning that they can only modify the data within their individual home directory unless explicitly given permission to do otherwise. For example, they cannot access data owned by other user-installed applications on the device. There is a very extensive set of privacy controls contained within iOS with options to control apps' ability to access a wide variety of permissions such as the camera, contacts, background app refresh, cellular data, and access to other data and services. Most of the code in iOS, including third-party applications, runs as the "mobile" user which does not have root privileges. This ensures that system files and other iOS system resources remain hidden and inaccessible to user-installed applications.[216]

App Store bypasses

Companies can apply to Apple for enterprise developer certificates. These can be used to sign apps such that iOS will install them directly [sometimes called "sideloading"], without the app needing to be distributed via the App Store.[222] The terms under which they are granted make clear that they are only to be used for companies who wish to distribute apps directly to their employees.[222]

Circa January–February 2019, it emerged that a number of software developers were misusing enterprise developer certificates to distribute software directly to non-employees, thereby bypassing the App Store. Facebook was found to be abusing an Apple enterprise developer certificate to distribute an application to underage users that would give Facebook access to all private data on their devices.[223][224][225] Google was abusing an Apple enterprise developer certificate to distribute an app to adults to collect data from their devices, including unencrypted data belonging to third parties.[226][222] TutuApp, Panda Helper, AppValley, and TweakBox have all been abusing enterprise developer certificates to distribute apps that offer pirated software.[227]

Network security

iOS supports TLS with both low- and high-level APIs for developers. By default, the App Transport Security framework requires that servers use at least TLS 1.2. However, developers are free to override this framework and utilize their own methods of communicating over networks. When Wi-Fi is enabled, iOS uses a randomized MAC address so that devices cannot be tracked by anyone sniffing wireless traffic.[216]

Two-factor authentication

Main article: Multi-factor authentication

Two-factor authentication is an option in iOS to ensure that even if an unauthorized person knows an Apple ID and password combination, they cannot gain access to the account. It works by requiring not only the Apple ID and password, but also a verification code that is sent to an iDevice or mobile phone number that is already known to be trusted.[216] If an unauthorized user attempts to sign in using another user's Apple ID, the owner of the Apple ID receives a notification that allows them to deny access to the unrecognized device.[228]

Main article: Usage share of operating systems

iOS is the second most popular mobile operating system in the world, after Android. Sales of iPads in recent years are also behind Android, while, by web use [a proxy for all use], iPads [using iOS] are still the most popular.[229]

By the middle of 2012, there were 410 million devices activated.[230] At WWDC 2014, Tim Cook said 800 million devices had been sold by June 2014.[231]

During Apple's quarterly earnings call in January 2015, the company announced that they had sold over one billion iOS devices since 2007.[232][233]

By late 2011, iOS accounted for 60% of the market share for smartphones and tablets.[234] By the end of 2014, iOS accounted for 14.8% of the smartphone market[235] and 27.6% of the tablet and two-in-one market.[236] In February 2015, StatCounter reported iOS was used on 23.18% of smartphones and 66.25% of tablets worldwide, measured by internet usage instead of sales.[237]

In the third quarter of 2015, research from Strategy Analytics showed that iOS adoption of the worldwide smartphone market was at a record low 12.1%, attributed to lackluster performance in China and Africa. Android accounted for 87.5% of the market, with Windows Phone and BlackBerry accounting for the rest.[238][239]

Main article: List of iOS devices

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• Hillegass, Aaron; Conway, Jon [March 22, 2012]. iOS Programming: The Big Nerd Ranch Guide [3rd ed.]. Pearson. ISBN 978-0-321-82152-2.
• Mark, Dave; LaMarche, Jeff [July 21, 2009]. Beginning iPhone 3 Development: Exploring the iPhone SDK [1st ed.]. Apress. ISBN 978-1-4302-2459-4.
• Mark, Dave; LaMarche, Jeff [December 29, 2009]. More iPhone 3 Development: Tackling iPhone SDK 3 [1st ed.]. Apress. ISBN 978-1-4302-2505-8.
• Turner, Kirby [December 19, 2011]. Learning iPad Programming: A Hands-on Guide to Building iPad Apps with iOS 5 [1st ed.]. Pearson. ISBN 978-0-321-75040-2.

Wikimedia Commons has media related to IOS [Apple Inc.].

• Official website
• Official website Dev Center at Apple Developer Connection
• iOS Reference Library – on the Apple Developer Connection website

For other uses, see 3G [disambiguation].

3G is the third generation of wireless mobile telecommunications technology. It is the upgrade over 2G, 2.5G, GPRS and 2.75G EDGE networks, offering faster data transfer, and better voice quality.[1] This network was superseded by 4G, and later on by 5G. This network is based on a set of standards used for mobile devices and mobile telecommunications use services and networks that comply with the International Mobile Telecommunications-2000 [IMT-2000] specifications by the International Telecommunication Union. 3G finds application in wireless voice telephony, mobile Internet access, fixed wireless Internet access, video calls and mobile TV.[1]

3G telecommunication networks support services that provide an information transfer rate of at least 144 kbit/s.[2][3][4] Later 3G releases, often denoted 3.5G and 3.75G, also provide mobile broadband access of several Mbit/s to smartphones and mobile modems in laptop computers. This ensures it can be applied to wireless voice calls, mobile Internet access, fixed wireless Internet access, video calls and mobile TV technologies.

A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s. Each generation is characterized by new frequency bands, higher data rates and non–backward-compatible transmission technology. The first commercial 3G networks were introduced in mid-2001.[5][6][7][8]

Several telecommunications companies market wireless mobile Internet services as 3G, indicating that the advertised service is provided over a 3G wireless network. Services advertised as 3G are required to meet IMT-2000 technical standards, including standards for reliability and speed [data transfer rates]. To meet the IMT-2000 standards, a system must provide peak data rates of at least 144 kbit/s.[4] However, many services advertised as 3G provide higher speed than the minimum technical requirements for a 3G service.[9] Subsequent 3G releases, denoted 3.5G and 3.75G, provided mobile broadband access of several Mbit/s for smartphones and mobile modems in laptop computers.[10]

3G branded standards:

• The UMTS [Universal Mobile Telecommunications System] system, standardized by 3GPP in 2001, was used in Europe, Japan, China [with a different radio interface] and other regions predominated by GSM [Global Systems for Mobile] 2G system infrastructure. The cell phones are typically UMTS and GSM hybrids. Several radio interfaces are offered, sharing the same infrastructure:
  • The original and most widespread radio interface is called W-CDMA [Wideband Code Division Multiple Access].
  • The TD-SCDMA radio interface was commercialized in 2009 and only offered in China.
  • The latest UMTS release, HSPA+, can provide peak data rates up to 56 Mbit/s in the downlink in theory [28 Mbit/s in existing services] and 22 Mbit/s in the uplink.
• The CDMA2000 system, first offered in 2002, standardized by 3GPP2, used especially in North America and South Korea, sharing infrastructure with the IS-95 2G standard. The cell phones are typically CDMA2000 and IS-95 hybrids. The latest release EVDO Rev. B offers peak rates of 14.7 Mbit/s downstream.

The 3G systems and radio interfaces are based on spread spectrum radio transmission technology. While the GSM EDGE standard ["2.9G"], DECT cordless phones and Mobile WiMAX standards formally also fulfill the IMT-2000 requirements and are approved as 3G standards by ITU, these are typically not branded as 3G and are based on completely different technologies.

The common standards complying with the IMT2000/3G standard are:

• EDGE, a revision by the 3GPP organization to the older 2G GSM based transmission methods, which utilizes the same switching nodes, base station sites, and frequencies as GPRS, but includes a new base station and cellphone RF circuits. It is based on the three times as efficient 8PSK modulation scheme as a supplement to the original GMSK modulation scheme. EDGE is still used extensively due to its ease of upgrade from existing 2G GSM infrastructure and cell phones.
  • EDGE combined with the GPRS 2.5G technology is called EGPRS, and allows peak data rates in the order of 200 kbit/s, just like the original UMTS WCDMA versions and thus formally fulfill the IMT2000 requirements on 3G systems. However, in practice, EDGE is seldom marketed as a 3G system, but a 2.9G system. EDGE shows slightly better system spectral efficiency than the original UMTS and CDMA2000 systems, but it is difficult to reach much higher peak data rates due to the limited GSM spectral bandwidth of 200 kHz, and it is thus a dead end.
  • EDGE was also a mode in the IS-136 TDMA system, no longer used.
  • Evolved EDGE, the latest revision, has peaks of 1 Mbit/s downstream and 400 kbit/s upstream but is not commercially used.
• The Universal Mobile Telecommunications System, created and revised by the 3GPP. The family is a full revision from GSM in terms of encoding methods and hardware, although some GSM sites can be retrofitted to broadcast in the UMTS/W-CDMA format.
  • W-CDMA is the most common deployment, commonly operated on the 2,100 MHz band. A few others use the 850, 900, and 1,900 MHz bands.
    • HSPA is an amalgamation of several upgrades to the original W-CDMA standard and offers speeds of 14.4 Mbit/s down and 5.76 Mbit/s up. HSPA is backward-compatible and uses the same frequencies as W-CDMA.
    • HSPA+, a further revision and upgrade of HSPA, can provide theoretical peak data rates up to 168 Mbit/s in the downlink and 22 Mbit/s in the uplink, using a combination of air interface improvements as well as multi-carrier HSPA and MIMO. Technically though, MIMO and DC-HSPA can be used without the "+" enhancements of HSPA+.
• The CDMA2000 system, or IS-2000, including CDMA2000 1x and CDMA2000 High Rate Packet Data [or EVDO], standardized by 3GPP2 [differing from the 3GPP], evolving from the original IS-95 CDMA system, is used especially in North America, China, India, Pakistan, Japan, South Korea, Southeast Asia, Europe, and Africa.
  • CDMA2000 1x Rev. E has an increased voice capacity [by three times the original amount] compared to Rev. 0 EVDO Rev. B offers downstream peak rates of 14.7 Mbit/s while Rev. C enhanced existing and new terminal user experience.

While DECT cordless phones and Mobile WiMAX standards formally also fulfill the IMT-2000 requirements, they are not usually considered due to their rarity and unsuitability for usage with mobile phones.[11]

Break-up of 3G systems

The 3G [UMTS and CDMA2000] research and development projects started in 1992. In 1999, ITU approved five radio interfaces for IMT-2000 as a part of the ITU-R M.1457 Recommendation; WiMAX was added in 2007.[12]

There are evolutionary standards [EDGE and CDMA] that are backward-compatible extensions to pre-existing 2G networks as well as revolutionary standards that require all-new network hardware and frequency allocations. The cell phones use UMTS in combination with 2G GSM standards and bandwidths, but do not support EDGE. The latter group is the UMTS family, which consists of standards developed for IMT-2000, as well as the independently developed standards DECT and WiMAX, which were included because they fit the IMT-2000 definition.

While EDGE fulfills the 3G specifications, most GSM/UMTS phones report EDGE ["2.75G"] and UMTS ["3G"] functionality.[13]

3G technology was the result of research and development work carried out by the International Telecommunication Union [ITU] in the early 1980s. 3G specifications and standards were developed in fifteen years. The technical specifications were made available to the public under the name IMT-2000. The communication spectrum between 400 MHz to 3 GHz was allocated for 3G. Both the government and communication companies approved the 3G standard. The first pre-commercial 3G network was launched by NTT DoCoMo in Japan in 1998,[14] branded as FOMA. It was first available in May 2001 as a pre-release [test] of W-CDMA technology. The first commercial launch of 3G was also by NTT DoCoMo in Japan on 1 October 2001, although it was initially somewhat limited in scope;[15][16] broader availability of the system was delayed by apparent concerns over its reliability.[17]

The first European pre-commercial network was an UMTS network on the Isle of Man by Manx Telecom, the operator then owned by British Telecom, and the first commercial network [also UMTS based W-CDMA] in Europe was opened for business by Telenor in December 2001 with no commercial handsets and thus no paying customers.

The first network to go commercially live was by SK Telecom in South Korea on the CDMA-based 1xEV-DO technology in January 2002. By May 2002, the second South Korean 3G network was by KT on EV-DO and thus the South Koreans were the first to see competition among 3G operators.

The first commercial United States 3G network was by Monet Mobile Networks, on CDMA2000 1x EV-DO technology, but the network provider later shut down operations. The second 3G network operator in the USA was Verizon Wireless in July 2002, also on CDMA2000 1x EV-DO. AT&T Mobility was also a true 3G UMTS network, having completed its upgrade of the 3G network to HSUPA.

The first commercial United Kingdom 3G network was started by Hutchison Telecom which was originally behind Orange S.A.[18] In 2003, it announced first commercial third generation or 3G mobile phone network in the UK.

The first pre-commercial demonstration network in the southern hemisphere was built in Adelaide, South Australia, by m.Net Corporation in February 2002 using UMTS on 2100 MHz. This was a demonstration network for the 2002 IT World Congress. The first commercial 3G network was launched by Hutchison Telecommunications branded as Three or "3" in June 2003.[19]

In India, on 11 December 2008, the first 3G mobile and internet services were launched by a state-owned company, Mahanagar Telecom Nigam Limited [MTNL], within the metropolitan cities of Delhi and Mumbai. After MTNL, another state-owned company, Bharat Sanchar Nigam Limited [BSNL], began deploying the 3G networks country-wide.

Emtel launched the first 3G network in Africa.[20]

Adoption

Japan was one of the first countries to adopt 3G, the reason being the process of 3G spectrum allocation, which in Japan was awarded without much upfront cost. The frequency spectrum was allocated in the US and Europe based on auctioning, thereby requiring a huge initial investment for any company wishing to provide 3G services. European companies collectively paid over 100 billion dollars in their spectrum auctions.[21]

Nepal Telecom adopted 3G Service for the first time in southern Asia. However, its 3G was relatively slow to be adopted in Nepal. In some instances, 3G networks do not use the same radio frequencies as 2G, so mobile operators must build entirely new networks and license entirely new frequencies, especially to achieve high data transmission rates. Other countries' delays were due to the expenses of upgrading transmission hardware, especially for UMTS, whose deployment required the replacement of most broadcast towers. Due to these issues and difficulties with deployment, many carriers could not or delayed the acquisition of these updated capabilities.

In December 2007, 190 3G networks were operating in 40 countries and 154 HSDPA networks were operating in 71 countries, according to the Global Mobile Suppliers Association [GSA]. In Asia, Europe, Canada, and the US, telecommunication companies use W-CDMA technology with the support of around 100 terminal designs to operate 3G mobile networks.

The roll-out of 3G networks was delayed by the enormous costs of additional spectrum licensing fees in some countries. The license fees in some European countries were particularly high, bolstered by government auctions of a limited number of licenses and sealed bid auctions, and initial excitement over 3G's potential. This led to a telecoms crash that ran concurrently with similar crashes in the fibre-optic and dot.com fields.

The 3G standard is perhaps well known because of a massive expansion of the mobile communications market post-2G and advances of the consumer mobile phone. An especially notable development during this time is the smartphone [for example, the iPhone, and the Android family], combining the abilities of a PDA with a mobile phone, leading to widespread demand for mobile internet connectivity. 3G has also introduced the term "mobile broadband" because its speed and capability made it a viable alternative for internet browsing, and USB Modems connecting to 3G networks, and now 4G became increasingly common.

Market penetration

By June 2007, the 200 millionth 3G subscriber had been connected of which 10 million were in Nepal and 8.2 million in India. This 200 millionth is only 6.7% of the 3 billion mobile phone subscriptions worldwide. [When counting CDMA2000 1x RTT customers—max bitrate 72% of the 200 kbit/s which defines 3G—the total size of the nearly-3G subscriber base was 475 million as of June 2007, which was 15.8% of all subscribers worldwide.] In the countries where 3G was launched first – Japan and South Korea – 3G penetration is over 70%.[22] In Europe the leading country[when?] for 3G penetration is Italy with a third of its subscribers migrated to 3G. Other leading countries[when?] for 3G use include Nepal, UK, Austria, Australia and Singapore at the 32% migration level.

According to ITU estimates,[23] as of Q4 2012 there were 2096 million active mobile-broadband[vague] subscribers worldwide out of a total of 6835 million subscribers—this is just over 30%. About half the mobile-broadband subscriptions are for subscribers in developed nations, 934 million out of 1600 million total, well over 50%. Note however that there is a distinction between a phone with mobile-broadband connectivity and a smart phone with a large display and so on—although according[24] to the ITU and informatandm.com the USA has 321 million mobile subscriptions, including 256 million that are 3G or 4G, which is both 80% of the subscriber base and 80% of the USA population, according[23] to ComScore just a year earlier in Q4 2011 only about 42% of people surveyed in the USA reported they owned a smart phone. In Japan, 3G penetration was similar at about 81%, but smart phone ownership was lower at about 17%.[23] In China, there were 486.5 million 3G subscribers in June 2014,[25] in a population of 1,385,566,537 [2013 UN estimate].

Decline and decommissions

Since the increasing adoption of 4G networks across the globe, 3G use has been in decline. Several operators around the world have already or are in the process of shutting down their 3G networks [see table below]. In several places, 3G is being shut down while its older predecessor 2G is being kept in operation; Vodafone Europe is doing this, citing 2G's usefulness as a low-power fall-back.[26] EE in the UK have indicated that they plan to phase out 3G by 2023 with the spectrum being used to enhance 5G capacity.[27] In the US, Verizon was planning to shut down its 3G services at the end of 2020 [later delayed to the end of 2022[28]], while T-Mobile/Sprint is planning to do so on 31 March 2022, and AT&T is planning to do so in February 2022.[29][30]

Currently 3G around the world is declining in availability and support. Technology that depends on 3G for usage will soon become inoperable in many places. For example, the European Union plans to ensure that member countries maintain 2G networks as a fallback[citation needed], so 3G devices that are backwards compatible with 2G frequencies can continue to be used. However, in countries that plan to decommission 2G networks as well, such as the United States, devices supporting only 3G and backwards compatible with 2G will soon be inoperable.[31]

It has been estimated that there are almost 8,000 patents declared essential [FRAND] related to the 483 technical specifications which form the 3GPP and 3GPP2 standards.[32][33] Twelve companies accounted in 2004 for 90% of the patents [Qualcomm, Ericsson, Nokia, Motorola, Philips, NTT DoCoMo, Siemens, Mitsubishi, Fujitsu, Hitachi, InterDigital, and Matsushita].

Even then, some patents essential to 3G might not have been declared by their patent holders. It is believed that Nortel and Lucent have undisclosed patents essential to these standards.[33]

Furthermore, the existing 3G Patent Platform Partnership Patent pool has little impact on FRAND protection because it excludes the four largest patent owners for 3G.[34][35]

ITU has not provided a clear[36][vague] definition of the data rate that users can expect from 3G equipment or providers. Thus users sold 3G service may not be able to point to a standard and say that the rates it specifies are not being met. While stating in commentary that "it is expected that IMT-2000 will provide higher transmission rates: a minimum data rate of 2 Mbit/s for stationary or walking users, and 348 kbit/s in a moving vehicle,"[37] the ITU does not actually clearly specify minimum required rates, nor required average rates, nor what modes[clarification needed] of the interfaces qualify as 3G, so various[vague] data rates are sold as '3G' in the market.

In a market implementation, 3G downlink data speeds defined by telecom service providers vary depending on the underlying technology deployed; up to 384kbit/s for UMTS [WCDMA], up to 7.2Mbit/sec for HSPA, and a theoretical maximum of 21.1 Mbit/s for HSPA+ and 42.2 Mbit/s for DC-HSPA+ [technically 3.5G, but usually clubbed under the tradename of 3G].[citation needed]

Compare data speeds with 3.5G and 4G.

Security

See also: Mobile security § Attacks based on the GSM networks

3G networks offer greater security than their 2G predecessors. By allowing the UE [User Equipment] to authenticate the network it is attaching to, the user can be sure the network is the intended one and not an impersonator. 3G networks use the KASUMI block cipher instead of the older A5/1 stream cipher. However, a number of serious weaknesses in the KASUMI cipher have been identified.[38]

In addition to the 3G network infrastructure security, end-to-end security is offered when application frameworks such as IMS are accessed, although this is not strictly a 3G property.

Applications of 3G

The bandwidth and location information available to 3G devices gives rise to applications not previously available to mobile phone users. It became possible to conveniently surf the internet on a 3G network on the go with minimum hassle, and do many other tasks previously a slow and difficult hassle on 2G. Medical devices, fire alarms, ankle monitors use this network for accomplishing their designated tasks alongside mobile phone users.[39] This network marked the first for a cellular communications network to be used in such a wide variety of tasks, kick-starting the beginning of widespread usage of cellular networks.

Both 3GPP and 3GPP2 are working on the extensions to 3G standards that are based on an all-IP network infrastructure and using advanced wireless technologies such as MIMO. These specifications already display features characteristic for IMT-Advanced [4G], the successor of 3G. However, falling short of the bandwidth requirements for 4G [which is 1 Gbit/s for stationary and 100 Mbit/s for mobile operation], these standards are classified as 3.9G or Pre-4G. 3GPP plans to meet the 4G goals with LTE Advanced, whereas Qualcomm has halted UMB development in favour of the LTE family.[40]

On 14 December 2009, TeliaSonera announced in an official press release that "We are very proud to be the first operator in the world to offer our customers 4G services."[41] With the launch of their LTE network, initially they are offering pre-4G [or beyond 3G] services in Stockholm, Sweden and Oslo, Norway.

• List of mobile phone generations
• Mobile radio telephone [also known as "0G"]
• Mobile broadband
• Wireless device radiation and health
• 1G
• 2G
• 4G
• 5G
• LTE [telecommunication]

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