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.Apple announced i OS 4 in March, 2010 and it was released to the public on June 21, 2010 alongside the i Phone 4.
June 2007 saw the official first version release of what eventually became i OS – concurrently with the first i Phone.
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.
UPDATE: You can now download older versions of apps from the App Store. No more updates for the i Phone 3G will be forthcoming.
Apple is officially leaving the i Phone 3G behind to run i OS 4.2.1 firmware forever.
Apple did not drop support for any devices with this release.
i Phone OS 2 was compatible with all i OS devices released up to that time.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.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 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 has way too much copyright ctap and will nickle-n-dime you to death for every little feature etc. Is the android market chock full of apps that won't run on these Android 2.6 phones? I have a problem with being cut off from the App Store because Apple decided to leave me behind, effectively forcing all 3G users to upgrade if they want fully functional devices.