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Guessing it is the WAP configuration, I was able to use my unlocked MyTouch 3G on Australia's Telstra 3G network which employs the same 850mhz technology as AT&T in the US.
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I think you are mistaken about it being the 3G network. T-Mobile uses 1700 MHz and 2100 MHz for their 3G. Check this
wiki link for confirmation.