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|A version of the iOS operating system|
iOS 4 running on an iPhone 4.
|Source model||Closed, with open source components|
|Initial release||June 21, 2010|
4.2.1 (November 22, 2010[±]
4.2.10 (July 25, 2011[±]
iPod touch (2nd generation)
iPod touch (3rd generation)
iPod touch (4th generation)
iPad (1st generation)
|Kernel type||Hybrid (XNU)|
|License||Proprietary EULA except for open-source components|
|Preceded by||iPhone OS 3|
|Succeeded by||iOS 5|
|Official website||iOS 4 at the Wayback Machine (archived June 30, 2010)|
|Unsupported as of about 2013|
iOS 4 is the fourth major release of the iOS mobile operating system designed by Apple Inc.. It was released on June 21, 2010, and was the first major release to be renamed to simply "iOS", and the first major release to drop support for some devices, as well as the first update that iPod Touch users did not have to pay for. iOS 4 was succeeded by iOS 5, which was released on October 12, 2011.
iOS 4 was introduced during the annual Apple Worldwide Developers Conference on June 7, 2010 together with the iPhone 4. With the release of the first-generation iPad earlier that year, the company renamed iPhone OS to iOS to reflect the entire family of devices. iOS 4.0 supported only the iPhone and iPod touch at launch, but later added iPad support. It also added over 1500 new APIs for developers, including the highly anticipated multitasking feature.
iOS 4.2.1, released November 22, 2010, was the first version to bring major feature parity to the iPhone and iPad. It was also the last to support the iPhone 3G and iPod Touch (2nd generation, MB & MC models).The release of the CDMA iPhone 4 for Verizon Wireless saw a branching of iOS. The 4.2 version sequence continued for the CDMA iPhone 4 while iOS 4.3 was released for all other products. iOS 4.3.5 was the final release on iOS 4.
iOS 4 raised the maximum number of home screen apps from 180 to 2160 due to the addition of folders. These folders would automatically be named based on the containing apps' respective App Store category. The ability to add custom wallpapers to the homescreen was also added (not supported on iPhone 3G and 2nd generation iPod Touch).The dock was also redesigned to be more reflective and match that of Mac OS X 10.5-10.6.
iOS 4 introduced Multitasking. It allows user to switch between the apps instantly by double clicking the home button. It was implemented in such a way that did not cause excessive battery drain or a large performance hit. The iPhone 3G and 2nd generation iPod Touch lack multitasking capabilities because of hardware limitations.
iOS 4 supports FaceTime, the video-chatting feature that debuted on the iPhone 4. It allows the user to perform face-to-face video conversation by just clicking the FaceTime button during a phone call or directly from the FaceTime app. It required a WiFi connection to work at the time.
iOS 4.1 added a new app called Game Center, an online multiplayer social gaming network, which allows users to invite friends to play the game and to compare their scores on a leaderboard. It was not available on the iPhone 3G.
Other new features
Some iPhone 4 users have reported technical problems with the antennas. Some carriers sued for smartphone’s defective antenna design which drops calls and has a weak signal. Apple eventually released iOS 4.2.1 and the CDMA Verizon iPhone 4 running iOS 4.2.2 in attempt to fix the problem.
Version history: Apple TV (2nd generation) onwards
iOS 4.1 was the first version of iOS available on the Apple TV (2nd generation). It included Apple TV Software 4.0.
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iPhone OS 3