i OS 5.1.1 is the final release supported for the i Pad (1st generation) and i Pod Touch (3rd generation). Apple announced i OS 6 on June 11, 2012 at its annual Apple Worldwide Developers Conference (WWDC) event, and it was released to the public on September 19, 2012 alongside the i Phone 5, i Pod Touch (5th generation), and i Pad (4th generation).With this release, Apple dropped support for the i Pod Touch (3rd generation), and the i Pad (1st generation) due to hardware limitations.It is also the first major i OS release that i Pod Touch users did not have to pay for.The release of i OS 4.2.1 brought compatibility to the original i Pad and is the final supported release on the i Phone 3G and i Pod touch (2nd generation) due to major performance issues.All other devices from the i Phone 3GS onwards; the i Pod Touch (4th generation) onwards; the i Pad 2 onwards; and the IPad Mini (1st generation) are supported.However, i OS 6 has limited support on the i Phone 3GS, i Pad 2, and i Pod Touch (4th generation).All other devices from the i Phone 3G onwards and the i Pod touch (2nd generation) onward are supported.However, i OS 4 has limited support for the i Phone 3G and i Pod Touch (2nd generation), as they lack of multitasking capabilities and the ability to set a home screen wallpaper.
Apple announced i Phone OS 1 at the i Phone keynote on January 9, 2007, and it was released to the public alongside the original i Phone on June 29, 2007.
Apple announced i OS 4 in March 2010 and it was released to the public on June 21, 2010 alongside the i Phone 4.
With this release, Apple dropped support for the original i Phone and i Pod touch, the first time they had done this.
The release of i Phone OS 2.1.1 brought support for the i Pod touch (2nd generation).
i Phone OS 2.2.1 is the final version of i Phone OS 2. Apple announced i Phone OS 3 in March 2009, and it was released to the public on June 17, 2009 alongside the i Phone 3GS.
June 2007 saw the official first version release of what eventually became i OS – concurrently with the first i Phone.