The three US carriers now have more capacity than they can sell for years. Verizon and T-Mobile are now actively selling fixed wireless, something they wouldn’t do unless that had plenty of unused spectrum. Verizon “capacity margin” has been increasing for years, and mid-band will easily double capacity. (Below)

AT&T’s purchase of mid-band spectrum brought it to parity with Verizon. T-Mobile has perhaps 15% more, insignificant when very few cells are ever congested.

This useful chart from Raymond James, courtesy of Mike Dano, shows roughly equal bars. (Larger below) New Street estimates that T-Mobile has more cell sites, 85,000 compared to ~70,000 at the others. US telcos don’t regularly release cell site counts, so these are estimates.

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