iOS 4
Operating system
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iOS 4 is the fourth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iPhone OS 3. It was announced at the Apple Special Event on April 8, 2010, and released on June 21, 2010. Wikipedia
Initial release date: June 21, 2010
Developer: Apple Inc.
Source model: Closed, with open source components
Update method: iTunes through a computer