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ATT phone on T-Mobile network

I just got a killer deal on a ATT S3 phone that I want to use on T-Mobile. While searching how to unlock it, I came across a few posts that suggests that just because a phone can be used on another network doesn't mean all of it's speed and features can be utilized.
I can't figure out if my service here in Portland OR is 1700 or 1900 mhz. I don't want a phone that I can only utilize half it's options. Should I keep it or get a T-Mobile S3?


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