When the original iPhone came along more than five years ago, it contained a set of sensors that opened up new possibilities: the proximity, ambient light and accelerometer sensors were all part of the package. The iPhone 3G added GPS, the iPhone 3GS threw in a magnetic compass, and a gyroscopic sensor debuted with the iPhone 4, enhancing the handset’s perception of how it is moved, a boon for augmented-reality games and applications.
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