Game changer: The iPhone then and now

From the original iPhone to the iPhone 4S, here's how Apple upped the ante on each iPhone model
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The iPhone's evolution: 2007 to 2011

The wraps are now off the new iPhone 4S. But how does it compare to past 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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