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The iPhone was first released in June of 2007, in the United States.
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The Iphone 3g started in the United States, then spread to other countries such as Australia, Austria, Belgium, etcc..
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The iPhone 3gs was released in June of 2009 in the United States.
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The iPhone 4 was started in the United States, but then later spread to the UK, Germany, France, and Japan.
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The iPhone 4s was released first in the United States, then Australia, Canada, France, and Japan.
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The notice of being released was in September of 2012 but was later released in late October 2012
