this is a great phone that i bought when it came out in 2006. i had verizon but i switched over specifically because of this phone. anyway, in order to make this phone work on tmobile, i had to get into it and enter data like "profile title"(t-mobile gprs), connection profile, name (in this case it was wap.voicestream.com). i only know all this because i have all that info copied on my hd. i remember i had to dial in an odd sequence of numbers, hit call, and when asked for a password i entered something like 00000. it took me to all those settings that i had to change.
i remember getting this info from some forum long gone by now.
so you're saying all i have to do is pop in a sim card and all that stuff gets reset? i oughta go ask att.