Will UK HTC Magic go 3G on AT&T network in USA?

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Hi all knowledgeable ones

I just moved to the US, and I'm trying to get my vodafone HTC Magic to go 3G with AT&T (or even T-mobile) but all I can get is 2G.

Anyone know the reason? Is it something to do with wrong radio frequencies? Can it be fixed, or is it just the wrong hardware?

Thanks in advance
Dave

becasue the rate that t mobile 3G use in USA is 1700MHz and at&t 3G use are 800/1900MHz but your phone 3G rete are 900/2100MHz. only 2G is available for you.