The T-Mobile phones work great on ATT..They use the same exact LTE bands..the benefit of getting the T-Mobile model is the unlocked boot loader...There will be much more developer support for this phone...ATT model will be thw same old crap ..locked boot loader..
The best way to remove it is to plug in the phone to the computer go to your phone look for your TWRP folder and delete...or Clockwork mod recovery...you can have them both installed and delete one or delete the recovery and install the other...You can install the recovery via odin while your...