iPhone OS is a mobile phone operating system created and developed by
Apple Inc. It was initial release in
June 29, 2007. This type of operating system is used in
iPhone,
iPad, and
iPod touch. It is the second most powerful mobile phone operating system in all over the world by sales, after
Android. Major versions of
iPhone operating system are released annually basis. The current release,
iOS 9.3, was released on
March 21, 2016.
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