Help moto x pure sim card says no service.

hello there guys, i had my moto x pure edition for about a day ago bought it from US, i plugged a simcard and it was working pretty well but i was not getting LTE, i thought maybe could be settings.. so i dialed *#*#4636#*#* to go change settings from there, so i selected LTE only and still couldn't get LTE there is an option at the top right corner that says select radio bands and there are three options (USA,PCS,CELLULAR) what i did is select USA band and from there my phone says no service, tried changing simcards, tried factory reset none seemed to work, i can see the simcard detects but still says no service just a blank network bar icon. so what could be wrong here please help as it was working perfectly fine, Currently i live in East Africa. sorry for my bad English hope im understood :(

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