There is definitely a good reason why T-Mobile is the 4th largest carrier in the US. Their coverage outside metro areas stinks. Their data coverage often has holes in large cities that drop you to edge.
On your last comment, Austria is the same size as Maine.. Maine is the 39th largest state.
I feel pretty confident in calling it the worst battery life of any phone on the market right now when used right out of the box. This changes when you root but that was two of my friend’s experience with the phone as well as also RMAing it twice each.
Branded T-Mobile are people with actual T-Mobile plans including prepaid through T-Mobile. MNVO would be Solavei which uses the T-Mobile network. Unbranded would be MNVOs and possibly include Straight Talk which can use T-Mobile.