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Yup as long your phone is "sim free" which is another term used for unlocked phones. When I got my sim free Desire I used T-mobile sim for first few months now Ive switched over to 3uk without any problems so I dont see why you shouldn't be able to do the same.

Steep??Ouch that pretty steep. What about a Nexus One.
Steep??
Sounds pretty cheap to me.
I bought mine yesterday someone on eBay who was local to me was selling an unwanted upgrade unused still in the security sealed box 200 cash