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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.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.The current stable release, i OS 11.4, was released on May 29, 2018.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.
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.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).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.