getting my UK phone to work in USA

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http://androidforums.com – Hey everybody! I recently came back from England, and I have the UK Samsung Galaxy SII. I purchased it with Vodafone on an 18 month contract. Anyways, contract was paid off, the phone is unlocked, and Im in the hunt for a carrier here. I wanted Verizon, but the CDMA-GSM issue wont allow that. I went to T-Mobile, and they said that my version of the SGII is different from theirs, and works at a slightly different frequency, meaning I would in essence only get 2G data on the phone. WTF!? The guy did say that AT&T has the same SGII as mine, so maybe their frequencies will better align. (General)