According to Phone arena the Xperia X10 is a global gsm phone that would work on t-mobiles networks and the X10A will work for At&t's networks. I would switch to T-mobile if I could get that phone on their network. anyone have any thoughts? Read Phone Arenas preview right here:
Sony Ericsson Xperia X10 Preview (Phone Arena Reviews)
Sony Ericsson Xperia X10 Preview (Phone Arena Reviews)