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.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.

i Phone OS 1.2, which after the first beta was replaced by a 2.0 version number; the second beta was named 2.0 beta 2 instead of 1.2 beta 2.

The other was i OS 4.2, replaced with 4.2.1 due to a Wi-Fi bug in 4.2 beta 3, causing Apple to release 2 golden masters (4.2 GM and 4.2.1 GM).

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.

i OS did not have an official name until the official release of the i Phone software development kit (i Phone SDK) on March 6, 2008.

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 tech firm - known for its trailblazing innovation - lost its charismatic front man Steve Jobs in 2011 and then faced a chorus of disapproval over allegations of child labor in its supply chain, not to mention long-reported harsh conditions in its Chinese factories.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.The final release supported on the original i Phone and i Pod Touch is i Phone OS 3.1.3.Apple announced i OS 4 in March 2010 and it was released to the public on June 21, 2010 alongside the i Phone 4.The current stable release, i OS 11.4, was released on May 29, 2018.