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I got my iphone 4 I used to have an iphone 3g on prepaid i cut down my simcard with a sim cutter and did not work to make this short I have gotten a total of 6 simcards from at&t they scan them and put my tel # on it, I go home cut the sim and insert it to the iphone and nothing I get the same bar for 10 mins then "no service" the only thing I have not done is gone out to buy another gophone brand new and activate it as I first did with the 3g. Could u please help me!!