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).
i OS 4 was the first major i OS release that reflected the name change.
Apple concurrently provides the same version of i OS for the comparable model of i Phone and i Pod Touch, usually devices released in the same calendar year.
i Phone users receive all software updates for free, while i Pod Touch users paid for the 2.0 and 3.0 major software updates.
As of i OS 4.0, Apple no longer charges money for i Pod Touch updates.
No official name was given on its initial release; Apple marketing literature simply stated the i Phone runs a version of Apple's desktop operating system, OS X.
Apple announced i Phone OS 2, at the i Phone software roadmap keynote in March 2008, and it was released to the public on July 11, 2008 alongside the i Phone 3G.
Before then, Apple marketing simply stated that i Phone ran a version of Mac OS X made specifically for i Phone. It was officially renamed i OS on June 7, 2010 with the announcement and introduction of i Pad.
The introduction of i Pad, and the existence of i Pod Touch, meant the i Phone was no longer the only device to run the mobile operating system.