T-Mobile uses the Verizon cell network I believe, not absolutely 100% certain, and the move from wired internet to OTA internet connectivity is starting to heat up with competitive products and service offerings. Have been researching for working on the road in an RV.
T-Mobile Rolls Out Two New Internet Plans to Give Customers Enhanced Options for Home and On the Go - T-Mobile Newsroom
If you have max bars cell reception, this might be a good option. If you have minimal bars, then a cell booster with antenna might be another great alternative to wired internet cost. . .
YMMV
former IT tech guy