Instruct: Classify Amazon reviews into positive or negative sentiment
Query: just plain bad

Had T-Mobile prepaid for about 5 months before I had to switch. Aside from billing disputes and questionable charges for prepaid minutes, T-Mobile is horrible on several levels. Coverage is terrible and customer service has been a nightmare (I suggest you record your phone calls). I now have Virgin and the difference is immediately noticeable - 3-4 bars of signal strength as opposed to 0-1, the phone actually rings now when I get a call, and text messages arrive instantaneously rather than a week later. So, if you like poor coverage and customer service, I highly recommend T-Mobile. Otherwise, do yourself a favor and look elsewhere.