Hi. I need some info because this is driving me crazy. I have a T-Mobile G2X. I just moved and my apt is in a place that is a random spot T-Mobile just doesn't have service... at all... no calls, no text, no data, nothing. just says "no service". However, my roommate who has AT&T has a perfect signal here. I guess my question is if I unlock the phone, even still using a T-Mobile sim, would it use the AT&T towers to get signal? If not, is there a way to use another providers towers?