Hey gang, I know this is an old thread, but I wanted to post an update just in case someone else might come across this thread.
After signing up with T-Mobile (back at the beginning of 2016 when I created this thread) they installed me under their "test drive" plan. Supposedly, this plan (according to the Rep I talked with) allowed you to have the phone for thirty days and if you didn't like it you could return it and owe them nothing. After a few days I discovered my $700 phone wasn't as great as I thought and the coverage stunk. I sent the phone back and that's when I started getting these bills from T-Mobile.
Even though the rep expressly told me several times when I was signing up that I could return the phone and cancel my account anytime during the test drive period, I started getting all these bills. First, off, they wanted me to pay $102 for my first month of service (even though I returned the phone during my 'test drive'). Second, they were trying to charge me $30.74 for some JUMP! service agreement. And finally, they were saying they never got the phone I returned and they were trying to charge me for that, too.
This is even lower behavior than Verizon, who also lied to me about my monthly service charge and charging me for the phone that I returned (even though they said I would NOT be charged anything when I returned the phone). I can't believe how easily these companies lie to you and then just send you bills for things they told you they were not going to charge you for. It's appalling and they should be reported.
I finally went on to their Facebook page and posted a message on their wall about this. Soon a Rep contacted me and after talking about the whole mess he cancelled all bills and cleaned up my account.
Eventually I went with AT&T, when I found out they had one Note 5 in their possession. After almost a year now I can say that AT&T service is much much better and so is the phone.