This question concerns device compatibility with the network. First, a little background is in order. We are on the T-Mobile network (postpaid) and very happy with the service. However, our old unlocked Alcatel Ideal is having USB connector problems. We also have an old Moto E4 (XT1526) that is locked to the Sprint network and currently active on Tello as a backup phone. The financial obligation on the Moto E4 has not been met, but it works great on Tello.

T-Mobile has been so reliable that a backup phone on another network was never needed. Will this Moto E4, locked to Sprint network, be usable on the T-Mobile network after the merger? Thank you for your advice!