A:AnswerPhones are made to the exact carriers specs. You need an unlocked phone....unless T-Mobile orders a bunch from Google/Motorola 2014 X 2nd Gens, enough to make it worth while....most of the smaller phone carriers are about 1 year behind to compete.
A:AnswerThere is no back cover. The battery is built in. I recommend a protection plan in case your battery goes bad (replaced free) or Crack the screen (reduced cost). The screen is $450 to replace without it because of the edges.