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very basic, some of the same features of an ipod
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has a slightly larger black frame around the screen (than the first)
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sort of the same as the 3G it is just a different model
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unlike the 3GS the back of the 4 is flat instead of round and the screen also got a little bigger
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the iphone 4S was the same as the 4 except it was the first iphone to have siri
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the iphone 5 was ''twice as fast'' the iphone 4 and its design was much skinnier
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the iphone 5C and 5S are basically the same except the design of the phone (the shape & colors)
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the iphone 6 and 6 plus are very much alike except the 6 plus has a much wider screen
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the i phone 6S is the same size as the 6 but has faster internet and better features
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the iphone SE is literally an iphone 6 but the design of the iphone 5S