Need some help here guys -- I currently have 4 lines with AT&T. 3 out of the 4 are out of contract. 1 has the UDP. However, I just picked up the iPhone 7+ when it came out on that UDP line. My monthly bill is around $300. I'm 1000% switching over to the T-Mobile One plan. Now my questions is, does this price increase waive the monthly installments owed to AT&T if I decide to switch carriers due to the break of contract ? I know the ETF's are waived but being that I am not under contract, does the same rules apply to the remaining balance of the phone ?