And will always be, as it is short distance and doesn't go through obstructions such as walls.
They placed a bad bet on Ultraband. They don't have enough lower band spectrum.
Their lead over AT&T and Verizonwill likely keep increasing.
"T-Mobile continues to expand its 5G network in ways that its rivals cannot match."
"The New Street analysts argue that AT&T and Verizon may never catch up to T-Mobile's lead in 5G spectrum ownership"
T-Mobile is on its way toward covering 100 million people with speedy midband 5G this year. And its 5G services are up to 25% cheaper than those from AT&T and Verizon.
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