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 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.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.Apple did not drop support for any devices with this release.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.i OS 4 was the first major i OS release that reflected the name change.
Apple announced i OS 4 in March 2010 and it was released to the public on June 21, 2010 alongside the i Phone 4.
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.
The i Phone 4 onwards, the i Pod Touch (5th generation), the i Pad 3 onwards and the i Pad Mini (1st generation) were fully supported.
Apple announced i OS 7 on June 10, 2013 at its annual Apple Worldwide Developers Conference (WWDC) event, and it was released to the public on September 18, 2013 alongside the i Phone 5C and i Phone 5S.
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 4.