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Cheezheng Level 1 Level 1 (0 points)

Hi, i forgot my passcode for my iphone 4 and restored the phone to factory settings and it updated itself to ios5, but now the phone says that the sim card is not supported. what should i do? I've tried with other sim cards and got the same error. Now the phone cannot be activated

iPhone 4, iOS 5.0.1
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