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The first iPhone was very thick. It also had a black bottom on the back.
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the 2nd iPhone was black or white with an apple symbol on it. This was their first phone with 3G.
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The iPhone 3 is black or white and has the same lay out as the iPhone 2
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The 3GS is the same thing as the 2nd iphone but the new one has voice and a better cammera.
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The iPhone 4 is a different model and is more squared.
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This is the latest iPhone it is much like the iPhone 4 but the new one has something called Siri. Siri is a voice app that you ask it any question and it anwers.
