The iPhone 4S is a touchscreen-based, slate-sized smartphone developed by Apple Inc. It is the fifth generation of the iPhone[5] and retains the exterior design of its predecessor, the iPhone 4, but is host to a range of improved hardware specifications and software updates.[6] The phone added a voice recognition system known as Siri, for which the S in the products name stands,[7] and a cloud storage service named iCloud. Some of the device's functions...