Problem with Unlocking T-Mobile Google G1?

ur_myhoon

New member
I recently received a Google G1, but I'm signed on to the AT&T Network on a plan without internet. The person who gave me the phone also gave me the unlock code so i could use it with my AT&T Sim Card. He said all i had to do was put in my SIM Card, and enter the code and my phone would be unlocked. Now when I enter the code it says that it failed. I was wondering, does this have to do with my lacking of a 3G plan on my AT&T phone, or maybe a wrong unlock code, or if i'm missing something here.
 
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