With the addition of parts of Austin, Los Angeles, Nashville, Orlando, San Diego, San Francisco, and San Jose, AT&T is now the only US carrier to provide 5G mobile coverage in 19 cities in the US. Last month, AT&T became the first US carrier to surpass 1 Gigabit mobile speeds on a live 5G connection.
https://www.notebookcheck.net/AT-T-now-provides-5G-mobile-coverage-in-no-less-than-19-US-cities.416153.0.html