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