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They changed the Iphone 1 in to the Iphone 3g because calling was killing the phone.
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They made the Iphone 3gs because the Iphone 3g was wat to slow and had a lot of lag.
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They made the Iphone 4 because the 3gs was way to fat so they wanted a Skinner phone.
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One reason why they got ride of the Iphone 4 and made the Iphone 5 is because people wanted a colored phone.
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A reason why the Iphone 6 was made is because people wanted a bigger phone.
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A reason why they wanted to make a Iphone 7 is because people wanted a water prove phone.