Help! I lost my network signal!

[DayronEZ]

I had the news that my carrier was enabling 3G so after looking for it "the normal way" and failing, I used he 4636 code, BUT when changing bands I enabled the 3 I had as options one by one and nothing (USA Band, Cellular, PCS) now I dont have access to neither my 2G GSM network because my carrier is in gsm 900MHz. And it doesnt have that option.
What can I do?
I have a factory unlocked Moto G4 Plus xt1644. RetUSA.
Please help me!
Thanks in advance.