S4 mini gt-i9195i 4g USA

[demosthenes92]

Hi. I've searched for months. I'm not a novice, but I'm not even close to programmer... I've a Samsung S4 mini i9195i running 4.4.4 . I rooted as soon as I got it, everything works great except 4g. I'm on tmobile in the USA, and I can't figure how to get 4g operable. Any information would be greatly appreciated. Thanks
Rooted with odin, twrp... su, titanium backup installed, stock rom

 

[Teracotta]

T-Mobile LTE won't work on the S4 Mini. T-Mobile uses a very specific LTE radio band (1700 mhz) that is only available on specific (usually T-Mobile branded) phones. You can use 3G and lower with T-Mobile on the international phones, and T-Mobile's original 4G (HSPA+) is just a boosted 3G.