I have had a terrible experience with the business reps and then customer service. If you have a business account with T- Mobile you are given a rep who will call and/or send emails with "special offers" of "free" products with either a low or no data feen (eg tablets.). I have even been told when I said I wouldn't use it 'why not get it anyway; you can give it away as a gift". I fell for this and for the emails that have FREE IN BOLD TYPE. I even asked specifically if this would cost anything and was assured it would not. Now fast forward a year - I find that I am being charged monthly for the device and for service. I contacted the new rep (they turn over regularly) who was going to look into it and never got mad. The next time I was contacted by still another new rep I explained the problem. This one directed me to customer service. I finally, after a lengthy conversation got her to agree to refund the data fees but not the cost of the tablets. She also claimed she couldn't even find one of the offers. A subsequent call to the new rep was never returned. In June I called and cancelled my service. I now find they only canceled the phone line but continued to charge data usage for the tablets! A friendly customer service rep arranged to refund the past month but not the previous month. I freely admit that I was not scrupulous in monitoring bills so I didn't catch these errors in a timely way. I claim naiveté and trust that businesses charge what they claim. Stay away from them!