ok ive had tmobile for almost 1 year, i got the htc mytouch 4g, love the little phone,,Ive never had any problems until starting last month,,,I live in Portland Or in the metro area, ive never had any problems,,now ALL the time my phone goes from 4g to 2g to G, to no signal at all, over and over plus im dropping calls like mad and i never used to sometimes its fine,,i call tmobile and they say they are working on the towers,,,blah blah,,does it take a month to work on the towers,,all I know is this reminds me of way back when I used to have voicestream,,,same problems!! i got another carrier after that and had no problems in my apartment,,i dont get it,,other ,,btw i changed sims to a newer one and it still made no difference,,hey Tmobile, you suck! I really think cdma is the way to go to get better building penetration,,but thats hard to say when it used to work fine in my apartment,,idk confused