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i OS 4.2.1 was the final version available for i Pod Touch (2nd generation) and i Phone 3G.Many features that were included in i OS 4 were not available for the i Phone 3G or i Pod Touch (2nd generation), such as multitasking and home screen backgrounds due to hardware limitations.Major new i OS releases are announced yearly during the Apple Worldwide Developers Conference (WWDC), and are usually released in September of the same year, usually coinciding with the release of new i Phone models.
June 2007 saw the official first version release of what eventually became i OS – concurrently with the first i Phone.
i OS is a mobile operating system, developed by Apple Inc. Updates for i OS are released through the i Tunes software, and, since i OS 5, via over-the-air software updates.
With the announcement of i OS 5.0 on June 6, 2011, a USB connection to i Tunes was no longer needed to activate i OS devices; data synchronization can happen automatically and wirelessly through Apple's i Cloud service.
i Phone OS 3.0 was officially released on June 17, 2009 for i Phone and i Pod Touch.
i Phone OS 3 had updates until version 3.1.3 (released on February 2, 2010).