(Apple's mobile operating system: Version 7) Introduced in September 2013, iOS 7 delivered the most dramatic change in Apple's touchscreen user interface since the first iPhone in 2007. Coinciding with the introduction of the iPhone 5S and 5C, iOS 7 featured new typography and a flatter look. Although Apple's built-in apps function much like previous ones, their appearance is very different. New features include a revamped Safari browser, smoother app switching and closing, enhanced camera and photo album functions and more Siri integration (a male voice option was also added). AirDrop lets you share photos via Wi-Fi with nearby Apple users, and the Pandora-like iTunes Radio is included. Users can phone other Apple users free over Wi-Fi via the new FaceTime Audio VoIP service. iOS 7 Needs 3GB for the Installation Also available for the iPhone 4/4S, iPad 2 and up and the 5G iPod touch, iOS 7 requires 3GB of empty storage to install, but after installation, it is not much bigger than iOS 6. For iPhone hardware changes, see iPhone 5S and iPhone 5C. For iOS version history, see iOS versions.