I just switched from ATT to T-Mobile. I received my new T-Mobile sim card in the mail today. However, when I put it in the phone I am asked for a sim PIN number. I've never seen a PIN before. I have tried 1234 and 1111, generic codes as suggested on other websites but no luck. I've tried over 20 times and no luck resetting the PIN either. Is this an issue with T-Mobile or do I need to contact ATT? My phone is a galaxy s3. Please help!! Thanks!
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