Originally Posted by ffranky
No it has service I'm using it on tmobile now, however, I'm on 4.1.2 and when I click check for software updates it says none available. To clarify I have service on tmobile with an unlocked AT&T htc one which I had to reset to stock rom. It is no longer rooted.
You won't be able to get the update then. T-Mobile hasn't released it yet. Even though the phone was originally AT&T, since it is now T-Mobile, you won't be able to update it. Well, not without rooting again and using some other ROM. You'll have to wait for T-Mobile to release it.