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|iOS 4 running on an iPhone.|
|Initial release||June 21, 2010source?][|
|Stable release||4.3.5 (July 25, 2011source?])[|
|Source model||Closed, with open-source components|
|License||Proprietary EULA except for open-source components|
|Kernel type||Hybrid (XNU)|
|Platform support||iPhone 3G, iPhone 3GS, iPhone 4, iPod touch (2nd generation), iPod touch (3rd generation), iPod touch (4th generation), iPad (1st generation), iPad 2|
|Preceded by||iPhone OS 3|
|Succeeded by||iOS 5|
iOS 4 is the fourth major version of Apple's iOS mobile operating system that runs on the iPhone and iPod Touch. It was released on June 21, 2010, and was the first version to be simply named "iOS". It was the first version of iOS to drop support for some devices and also the first version that iPod Touch users did not have to pay for.
The iPhone 3G and iPod Touch (2nd generation) can't have a wallpaper or multitasking, while the iPhone 3GS, iPhone 4, and 3rd and 4th generation iPod Touch have them. The first generation iPhone and iPod Touch cannot run iOS 4.
- "iOS 4.2 Software Update". Apple Inc.. November 22, 2010. http://support.apple.com/kb/dl1061. Retrieved July 17, 2014.
- "Download iOS 4.3 for iPhone, iPad, iPod touch". Redmond Pie. March 10, 2011. http://www.redmondpie.com/download-ios-4.3-iphone-4-3gs-ipad-2-ipad-ipod-touch-apple-tv-final-version-direct-links/. Retrieved July 17, 2014.