Can I cancel service with T-Mobile even though I still owe on an EIP device?

Last year I switched from AT&T to T-Mobile to try and save a little money and get a new phone. Big mistake… I barely have service anywhere and i'm constantly dropping calls when I do have service. I have unlimited data, but that's just about the only good thing. I wanted to switch to Verizon a couple of months ago so I went into pay the remaining $300 I owed on my iPhone 5S and cancel my plan (they don't have contracts). I was talked into upgrading to an iPhone 6 and was told that because my 5S was so new, that I would owe just about the same amount on the 6 and would be able to pay it off then and save a little bit of money rather than going straight to Verizon. Well, they lied. I now owe $500 something on an iPhone 6. I was completely irate. I went over everything in detail with the salesman before I signed any paperwork.

Now i'm stuck with a phone that I still owe $500 on and have TERRIBLE service everywhere I go. Is it possible to cancel my plan with T-Mobile and just pay the EIP payment for the phone I have with them so that I can go ahead and get a contract with Verizon, or do I have to have the phone in use in order to make the payments? What are my options here? I know I can't just give them the phone back for an EIP credit, although that would be convenient. I honestly don't care if I'm at a little bit of a loss here because I'm so sick of not having service anywhere.

The carrier will expect that when you pay your final bill after you cancel, that you ALSO pay off the remaining balance on your phone. You can ask to make payments, but you signed a contract (yes the EIP is a contract), to pay it off in full of you leave BEFORE the two years it takes to pay it off in payments. You signed and agreed to that, so it does not matter what the salesperson may have said, if it is NOT in the paperwork that your signed, it is not going to be honored.