The iPhone 5S is a smartphone developed byApple Inc. It is part of the iPhone line, and was released on September 20, 2013. Apple held an event to formally introduce the phone, and its mid-range counterpart, the iPhone 5C, on September 10, 2013.
As with the principle of the iPhone 3GS andiPhone 4S models, the iPhone 5S is a revised version of its predecessor, the iPhone 5. The phone maintains a similar design to the iPhone 5, aside from the introduction of a new home button design using a laser-cutsapphire cover surrounded by a metallic ring,Touch ID, a fingerprint recognition system built directly into the home button which can be used to unlock the phone and authenticateApp Store and iTunes Store purchases, and an updated camera with a larger aperture and a dual-LED flash optimized for different color temperatures. The iPhone 5S also introduced the 64-bit A7 processor (which Apple claimed was the first 64-bit processor to be used on a smartphone), accompanied by the M7"motion co-processor", a dedicated processor for processing motion data from itsaccelerometer and gyroscopes without requiring the attention of the main processor. The iPhone 5S was also the first Apple device to ship with the newest version of the iOSmobile operating system, iOS 7, which introduced a revamped visual appearance and other new features.
Reception towards the iPhone 5S was generally positive, with some outlets considering it to be the best smartphone available on the market due to its upgraded hardware, Touch ID, and other changes introduced by iOS 7. However, others criticized the iPhone 5S for being too similar to its predecessors, while others showed security concerns about the Touch ID system. The iPhone 5S, along with the iPhone 5C, sold nine million units on their weekend of release, breaking Apple's sales record for iPhones, and was the best selling phone on all major US carriers in September 2013.
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