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Steve Jobs invented the iphone. The iphone 2G was the first to come out on June 29, 2007.
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The rounded back of the 3G also extends out further than that of the original iPhone. The iPhone 3G is also slightly wider than the original iPhone, though not enough to notice.
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First Iphone with a camera.
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First Iphone with siri
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the Iphone 5 is just longer than the iphone 2,3,4 and 4s
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Iphone 5s has the finger print. You put one of your fingers on the home button and it unlocks your phone.
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The Iphone5C si the first colorful Iphone.