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In pictures: 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

iPhone touchscreens ...

iPhone: 3.5 inches diagonally, 320 by 480 pixels

iPhone 3G: 3.5 inches diagonally, 320 by 480 pixels

iPhone 3G S: 3.5 inches diagonally, 320 by 480 pixels

iPhone 4: 3.5 inches diagonally, 640 by 960 pixels (Retina display)

iPhone 4S: 3.5 inches diagonally, 640 by 960 pixels (Retina display)

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