Use IMEI blocked iPhone on another carrier? (Read description first)?

The phone was legitimately purchased by me at GameStop. The phone worked for a few seconds and quit on me. By calling 611(the AT&T wireless customer portal), it indicated to me that it's IMEI blocked. I'm using a GoPhone SIM card and was wondering if I could just use T-Mobile instead to use the phone.

Added (1). Edit: I was using an iphone 3G for about a year and then moved my card over to the 4s.

True… Gophone SIM are blocked on All ATT Feature phones, including its Iphones, Androids, Blackberries, Windows, and Palms… NO SMARTPHONE CAN USE A GOPHONE SIM

Just jailbreak your iphone… Pop in a tmobile sim… And enjoy

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