At the Macworld Expo on Jan. 9, 2007, then-CEO Steve Jobs announced the first iPhone. Apple fans were delighted, but most everyone else was skeptical. Five years late, the iPhone has upended and redefined the mobile market, thanks to a relentless series of improved models. Take a tour of each generation of iPhone and the capabilities it has brought to the mix: the processors, storage capacity, touchscreens, sensors, and more.
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