I am debating between buying a t-mobile branded blackberry 9900 or an at&t branded one for use with t-mobile's $30 unlimited text/5gb data + 100min plan ($40/month with BIS). I know if you get an at&t phone you can only reach EDGE speeds on t-mo's service and vice versa, but I looked at my coverage map (54304) and T-mo's coverage is "partner" for my whole city, whereas if I go with at&t branded BB my coverage would be 3G... the reason it even matters is because I'm hoping Straight Talk will support BIS sometime in the future, or someone could find a way around that matter (I know of deathtrap's service book mods ^^) so that I could still use BBM and the like. Since t-mo's coverage is going to be crap whether or not I buy their branded device should I just go with the at&t branded BB? I hope I made sense. Thank you for your help.