ok so im currently an att/cingular user in the US. they are refusing to go into my device profile and enable the mms settings. now im thinking about switching to T-mobile. i have a couple of questions. First, how would you rate the service you receive as far as signal etc etc. Secondly, what plan do i need to get as far as data packages for my iphone to work with t mobile to receive mms messages. Lastly. will they let me go in there and just buy a plan without buying a phone? Any help would be greatly appreciated.