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iPhone 4SThe fifth model of Apple's smartphone, introduced in October 2011. Housed in an almost-identical case as the iPhone 4, the 4S sports numerous internal changes, including a fast dual-core A5 CPU, dual antennas and an eight-megapixel camera with improved optics. The iPhone 4S debuted with the iOS 5 operating system, which provides cloud storage for a user's content (see iOS versions and iCloud). Models with 16, 32 and 64GB of storage are available. As of 2012 in the U.S., AT&T, Verizon and Sprint offer the iPhone 4S. See iPhone, iPhone 5 and iPhone 5S.
The Siri Intelligent Assistant
A highly touted feature of the 4S is Siri, a voice-based command system that answers questions and takes dictation. For more details, see Siri.
|Siri Is Built In|
|Looking identical to the 4, the iPhone 4S includes numerous internal enhancements. The 4S features the Siri intelligent assistant (center), and the camera's crop function is shown on the right. (Image courtesy of Apple Inc.)|