iOS 4 is the fourth major release of the

iOS iOS (formerly iPhone OS) 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 include ...

mobile operating system A mobile operating system is an operating system for mobile phones, tablets, smartwatches, smartglasses, or other non-laptop personal mobile computing devices. While computers such as typical laptops are "mobile", the operating systems used on ...

developed by

Apple Inc. Apple Inc. is an American multinational technology company headquartered in Cupertino, California, United States. Apple is the largest technology company by revenue (totaling in 2021) and, as of June 2022, is the world's biggest company ...

, being the successor to iPhone OS 3. It was announced at the Apple Special Event on April 8, 2010, and was released on June 21, 2010. iOS 4 is the first iOS version issued under the "iOS" rebranding, dropping the "iPhone OS" naming convention of previous versions. It was succeeded by

iOS 5 iOS 5 is the fifth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 4. It was announced at the company's Worldwide Developers Conference on June 6, 2011, and was released on October 12, 201 ...

on October 12, 2011. iOS 4 introduced folders on the home screen, significantly increasing the number of apps that can be displayed. Support for custom wallpapers was also added, although limited to newer devices due to animation performance requirements. The operating system also added a multitasking feature, letting apps dealing with Internet calling,

location In geography, location or place are used to denote a region (point, line, or area) on Earth's surface or elsewhere. The term ''location'' generally implies a higher degree of certainty than ''place'', the latter often indicating an entity with an ...

and audio playback function in the background, whereas a similar but more restricted "Fast App Switching" technology enabled any app to be left inactive in the background while users switch to other apps. iOS 4 also added a system-wide spell checking feature, enabled iBooks on iPhone, unified the

Mail The mail or post is a system for physically transporting postcards, letters, and parcels. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal sys ...

inbox to combine content from different email providers, and introduced both

Game Center Game Center is a service by Apple that allows users to play and challenge friends when playing online multiplayer social gaming network games. Games can now share multiplayer functionality between the Mac and iOS versions of the app. Game C ...

for social gaming and

FaceTime FaceTime is a proprietary videotelephony product developed by Apple Inc. FaceTime is available on supported iOS mobile devices running iOS 4 and later and Mac computers that run and later. FaceTime supports any iOS device with a forward-faci ...

for

video calling Videotelephony, also known as videoconferencing and video teleconferencing, is the two-way or multipoint reception and transmission of audio and video signals by people in different locations for real time communication.McGraw-Hill Concise Ency ...

. The iOS 4 update introduced performance and battery problems on

iPhone 3G The iPhone 3G (also known as iPhone 2) is a smartphone that was designed and marketed by Apple Inc.; it is the second generation of iPhone, successor to the original iPhone, and was introduced on June 9, 2008, at the WWDC 2008 at the Mosco ...

devices, with Apple investigating the matter and promising then-upcoming updates. However, the company became the subject of a lawsuit from a unsatisfied customer over the issues. Around the same time, the release of

iPhone 4 The iPhone 4 is a smartphone that was designed and marketed by Apple Inc. It is the fourth generation of the iPhone lineup, succeeding the iPhone 3GS and preceding the 4S. Following a number of notable leaks, the iPhone 4 was first unvei ...

and its subsequent antenna problems made Apple focus on unsuccessfully attempting to

patch Patch or Patches may refer to: Arts, entertainment and media * Patch Johnson, a fictional character from ''Days of Our Lives'' * Patch (''My Little Pony''), a toy * "Patches" (Dickey Lee song), 1962 * "Patches" (Chairmen of the Board song) ...

the issues with software updates. This is also the final iOS operating system to have, on iPhones, an iPod app for music and videos; starting with iOS 5, iPhones have the same separate Music and Videos apps as do iPod Touch and

iPad The iPad is a brand of iOS and iPadOS-based tablet computers that are developed by Apple Inc. The iPad was conceived before the related iPhone but the iPhone was developed and released first. Speculation about the development, operating ...

models.

Apps

* iBooks *

History

iPhone OS 4 was introduced at the Apple Special Event on April 8, 2010. At the

WWDC The Worldwide Developers Conference (WWDC) is an information technology conference held annually by Apple Inc. The conference is usually held at Apple Park in California. The event is usually used to showcase new software and technologies in t ...

keynote address on June 7, 2010, it was renamed to iOS 4 in order to be more inclusive to the iPod Touch and iPad. iOS 4 was officially released on June 21, 2010.

Updates

System features

Home screen

iOS 4 raised the maximum number of home screen apps from 180 to 2,160 due to the addition of folders. These folders would automatically be named based on the containing apps' respective

App Store An App Store (or app marketplace) is a type of digital distribution platform for computer software called applications, often in a mobile context. Apps provide a specific set of functions which, by definition, do not include the running of the c ...

category. The ability to add custom wallpapers to the home screen was also added, though the feature was notably absent from

and the second-generation iPod Touch due to poor performance of icon animations.

Multitasking

iOS 4 introduced multitasking. The feature allowed users to switch between apps instantly by double-clicking the home button. It was implemented in such a way that did not cause excessive battery drain. Multitasking was limited to apps dealing with Internet calling,

, and audio playback, while a similar "Fast App Switching" technology meant users could leave an app and enter another, with the original app remaining in the background until the user returns. This feature was notably absent from iPhone 3G and the second-generation iPod Touch due to performance issues.

Spell check

iOS 4 introduced a

spell checking In software, a spell checker (or spelling checker or spell check) is a software feature that checks for misspellings in a text. Spell-checking features are often embedded in software or services, such as a word processor, email client, electronic di ...

feature that underlined misspelled words in red. Tapping on the word would provide a pop-up with a recommended replacement.

Camera

The Camera app now supports 5x digital zoom.

App features

iBooks

iOS 4 introduced iPhone and iPod Touch support in iBooks, which was already included on iPad. Though not a default app, it was available through

Mail

The

app featured a unified inbox on iOS 4, allowing users to see messages from all of their email accounts displayed together in a single inbox. It also gained support for MobileMe e-mail aliases and multiple

Exchange Exchange may refer to: Physics *Gas exchange is the movement of oxygen and carbon dioxide molecules from a region of higher concentration to a region of lower concentration. Places United States * Exchange, Indiana, an unincorporated community * ...

accounts for business users.

Game Center

iOS 4.1 added a new app called

, an online multiplayer social gaming network, which allows users to invite friends to play games and to compare their scores on a leaderboard. It was not available on the

FaceTime

iOS 4 introduced

, a

videotelephony Videotelephony, also known as videoconferencing and video teleconferencing, is the two-way or multipoint reception and transmission of audio and video signals by people in different locations for real time communication.McGraw-Hill Concise Ency ...

app that uses the device's camera to allow the user to make video calls with other FaceTime users. This feature was absent from the

, second-generation iPod Touch, iPhone 3GS, and third-generation iPod Touch due to the lack of required features, such as a front-facing camera.

Safari

The Safari mobile

web browser A web browser is application software for accessing websites. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the user's screen. Browsers are used o ...

on iOS 4 added

Bing Bing most often refers to: * Bing Crosby (1903–1977), American singer * Microsoft Bing, a web search engine Bing may also refer to: Food and drink * Bing (bread), a Chinese flatbread * Bing (soft drink), a UK brand * Bing cherry, a varie ...

as a search option in addition to

Google Google LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...

and

Yahoo! Yahoo! (, styled yahoo''!'' in its logo) is an American web services provider. It is headquartered in Sunnyvale, California and operated by the namesake company Yahoo Inc., which is 90% owned by investment funds managed by Apollo Global Manage ...

. Beginning with iOS 4.2.1, specific words or phrases on a page could be searched.

Problems

Performance and battery issues

users reported performance and battery issues after upgrading to iOS 4. Apple started an investigation of the matter in July 2010. In November, Apple was sued for the issues, with an unsatisfied customer alleging "violating the Consumer Legal Remedies Act, unfair business practices, and false and deceptive advertising", with further allegations that Apple knew its software would cause problems on older models. Apple never responded to the allegations, but wrote in a reply to another unsatisfied customer in August 2010 that updates were "coming soon".

Alarm clock

In all versions of iOS 4, the alarm clock in the clock app had a problem in DST when it would go off an hour too early or too late.

Antenna problems

Upon its release, some

users reported having technical problems with the phone's antennas. Apple attempted to fix the issue in software with iOS 4.0.1, but failed to do so.

Supported devices

The first-generation iPhone and the first-generation iPod Touch cannot run iOS 4 and above due to hardware limitations, though the

did receive iOS 4, despite it having the same processor as the

iPhone 2G The iPhone (retrospectively referred to unofficially as the iPhone 2G, iPhone 1 or original iPhone) is the first iPhone model and the first smartphone designed and marketed by Apple Inc. After years of rumors and speculation, it was officia ...

. This marked the first time Apple dropped support for older devices.

iPhone

* iPhone 3GS *

iPod Touch

iPod Touch (2nd generation) The second-generation iPod Touch (marketed as "the new iPod touch", and colloquially known as the iPod Touch 2G, iPod Touch 2, or iPod 2) is a multi-touch mobile device designed and marketed by Apple Inc. with a touchscreen-based user interfac ...

iPod Touch (3rd generation) The third generation iPod Touch (marketed as "the new iPod touch", and colloquially known as the iPod Touch 3G, iPod Touch 3, or iPod 3) is a multi-touch mobile device designed and marketed by Apple Inc. with a touchscreen-based user interfac ...

* iPod Touch (4th generation)

iPad

* iPad (1st generation) *

iPad 2 The iPad 2 is a tablet designed, developed and marketed by Apple Inc. Compared to the first iPad, as the second model in the iPad line, it gained a faster dual core A5 processor, a lighter build structure, and was the first iPad to feature V ...

Apple TV

* Apple TV (2nd generation)

References

External links

* {{Apple *4 2010 software Products introduced in 2010 Mobile operating systems Tablet operating systems Proprietary operating systems