iOS (known as iPhone OS before June 2010) is Apple's mobile operating system. Originally developed for the iPhone, it has since been extended to support other Apple devices such as the iPod touch, iPad and Apple TV.

Apple provides updates to the operating system for the iPhone, iPad and iPod Touch system through iTunes, similar to the way that other iPods are updated, and touts this as an advantage compared to other mobile phones and devices.[1] Security patches, as well as new and improved features, are released in this fashion.

Overview

Apple's iOS did not have an official name until the release of the iPhone software development kit (iPhone SDK) on March 6, 2008. Before then, Apple marketing literature simply stated that their iPhone runs a version of "OS X", a reference to iOS's parent, Mac OS X. When introduced, it was named iPhone OS. It was renamed iOS on June 7, 2010, presumably since it is now designed for four devices other than the iPhone. As of May 6, 2011 the current version of iOS is 4.3.3 for iPhone (GSM), iPod Touch, iPad, and Apple TV second generation. That same day a special iOS build, 4.2.8, was released for the CDMA iPhone. However, the first generation iPod Touch and iPhone have iOS 3.1.3 as their latest version; and the second generation iPod Touch and iPhone 3G have iOS 4.2.1 as their latest version. The Developer Beta for version 3.0 was made available on March 17, 2009, with iOS 3.0 being released June 17, 2009.


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iOS Version History - Wikipedia, the free encyclopedia


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