US Mobile doesn't own cell towers, yet offers nationwide coverage. Find out how it works, what networks it uses, and who ...

In an exclusive chat with T-Mobile executives before the announcement, I learned which moves took the carrier from No. 4 to the top.

Ookla Speedtest has just named T-Mobile the best mobile network in America, in what it claims is one of the biggest network tests of its kind. Is this true and what does it mean?