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iOS 2, originally called iPhone OS 2, is the second major release of Apple's iOS mobile operating system. It was released on July 11, 2008, alongside the iPhone 3G. This version introduced significant features such as the App Store, making third-party applications officially available, redesigned Mail app with push email, support for multiple calendars, improved Contacts with a search bar and SIM contact import, and added parental controls. It supported devices like the first-generation iPhone and iPod Touch and marked a major step forward from iPhone OS 1.