just an FYI - I have been with t-mobile (voicestream) for over 2 years, and i called them a few months ago to try and sign up for unlimited nights and it was no longer availabe
also..since i've moved, i've had pretty bad reception with them..its pretty sporadic..i'll be driving and have a full signal, 2 seconds later i won't have any signal i'll drive for another minute and i'll have 1/2 a signal etc..its VERY finicky..however, i never had this problem in new mexico or arizona..