My wife has had not the RAZR phone but another Motorola phone with T-mobile for over a year now.  All I can say is that when the phone was NEW, the T-mobile service is VERY spotty and unreliable.  I have Verizon and it worked much better.  Anyway...  After a year, the headset jack in her motorola phone is loose and doesn't work with headsets anymore.  In addition, her calls last about 30 seconds before getting dropped now.  Obviously something wrong with the phone.  In my experience Motorola doesn't make very reliable cell phones.  We have had 3 different models of Samsung cell phones in the past and they are rock solid, durable, and reliable.  Not sure why Motorola can't get with the program.  So we just terminated T-mobile service, got her a Samsung phone (SCH-A630) through Verizon and SHE IS VERY HAPPY!