|This article needs additional citations for verification. (October 2015)|
|A version of the iOS operating system|
iOS 4 running on an iPhone 4.
|Source model||Closed, with open source components|
|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|
|Unsupported as of about 2012|
iOS 4 is the fourth version 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.
The iPhone 3G and 2nd generation iPod Touch lack multitasking capabilities and the ability to set a home screen wallpaper, while the iPhone 4, iPhone 3GS, 3rd and 4th generation iPod Touch have them. The iPhone and the 1st generation iPod Touch cannot run iOS 4 and above.
iOS 4.2.1, released November 22, 2010, added iPad compatibility. It was the last to support iPhone 3G and iPod Touch (2nd generation, MB & MC models).
iOS 4.0 was released to the public and supported only the iPhone and iPod touch. iOS 4.0 was announced to have over 1500 new APIs for developers, supporting the highly anticipated multitasking feature. The final iOS version for the 2nd generation iPod Touch and iPhone 3G is iOS 4.2.1. iOS 4.2.1 was the first version to bring major feature parity to the iPhone and iPad. 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 added features such as multitasking, folders, and home screen wallpapers. Multitasking and home screen wallpapers were not available on the iPhone 3G and the iPod touch (2nd generation).
iPhone 3G users reported performance and battery issues. Apple released iOS 4.1 and 4.2.1 in attempt to fix the performance issues.
Version history: portable iOS devices
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.
- "About Apple TV (2nd generation) software updates". Support.apple.com. December 14, 2010. Retrieved January 9, 2011.
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iPhone OS 3