04-14-2008, 12:47 PM
Join Date: Apr 2008
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As far I know, you can call ATT Customer Service and tell them the story "I will travel for a while and want my phone unlock so I can use abroad", which is in your case, a true story, they will be happy give you the unlock code for free. T-mobile do that all the time without even ask you any single question.
Then you follow the instruction link above to unlock your phone.
Or if you don't mind paying people $30 - $48 for the code, then go to websites like GSMphonesoure and purchase the code.