the competitors, and they complain about it to the NARB constantly if they think a competitor is not being truthful. Coverage maps in particular get a lot of scrutiny.
I'm not saying that TMO's ads, like any other company's ads, aren't biased to make them look as good as possible. But I am saying that those coverage maps are accurate as of now.
Example of NARB process:
https://www.rcrwireless.com/20200521/carriers/advertising-watchdog-says-att-5ge-marketing-is-misleading
Third party overview of 5G coverage maps:
https://www.whistleout.com/CellPhones/Guides/5g-coverage-maps-comparedEdited by TigerJackSwartz at 11:46:00 on 04/14/21