Not as easy as it looked. You have to get your phone to read the bands that T-Mobile is working with. There is a bunch of us, even a bounty out for it! Trying to get the N9005 version to read At&t LTE bands! Sure you can flash the modem but unsure if it'll work. Keep us updated though if you do flash and receive LTE service!
I apologize, I didn't realize you were perfect and a stupid question never left your mouth. Pardon me sir!
✔ Galaxy Note Ⅲ N900A Current
✖ Galaxy Note Ⅲ N9005 SOLD
✖ Galaxy S Ⅲ RIP