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The first iPhone came out on June 29th 2007. It was avalibable by AT&T and other main carriers, and also avaliable in Germany, Canada, Mexico, and other main countries.
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On June 19th, 2009, the iPhone 3gs came out. And was avaiable for all local carriers.
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The iPhone 4 came out in June 2010, and was in black and white in many countires.
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The iphone 4s came out in 2011.