I'm gonna put it this way: In an apartment complex I used to live in, AT&T service was terrible while Sprint (still a thing at the time) and Tmobile had okay service, and Verizon had great service.

One of my neighbors there was literally worked for AT&T as a telcom engineer or something, and was as such eligible to get free cell service from AT&T.

He paid the hundred bucks or whatever at the time for Verizon, instead of the literally free service he could get from his employer, because it was so terrible. Good riddance.