yup, since you have the U firmware and on Tmobile, you do not need to do anything additional since LTE band support on tmobile is out of the box.
V useful thread. I have Sprint Galaxy S7 (SM-G930P) and according to the Samsung it does not have LTE Band 40 so I went ahead to activate it. However, when I tried the method described in this thread I noticed the Band 40 already is activated. I have U rom installed (G930UUES4BRC1). Does anyone know how to check if which bands are really functional.
Worked on S7 Edge
I have a Verizon sim unlocked S7 Edge SM-G935V. I left it stock, no root, and updated the firmware to SM-G935U, XAA version. I then used this method to get all but one of the bands I wanted, 2, 4, 5, 12, 13, 17, 19, 25, 26, 29, 30 and 41. The only band I wasn't able to get was band 14 which is an AT&T band. I didn't deselect any bands so I have the other bands that were already selected as well. This method worked flawlessly. Thanks!
Hi, I am on Nougat 7.0, keying in *#0808# in the dialer does nothing, not rooted and stock ROM, anyway I can get this working without downgrading to 6.0.1, I am on a sprint phone that is unlocked, and right now I have an AT&T SIM in it, but I don't get LTE as the bands are not enabled