I have connected my iphone3g to itunes and it asked if I want to improve, and I agreed. Now, the phone is locked, indicating that my sim card is not supported. What can I do?

. I have connected my phone3g to itunes and it asked if I want to improve, and I agreed. Now, the phone is locked, indicating that my sim card is not supported. What can I do? Can I uninstall the upgrade and bring him back as it was?

Please help my phone is now dead.

Thank you

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Tags: iPhone

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