T-Mobile said more than half a million miles in the US are uncovered by cell signals from any provider. These mobile dead zones exist mostly because of land-use restrictions (national parks, for example) as well as terrain limitations (mountains and deserts) and the sheer vastness of the US.
https://www.techspot.com/news/95778-t-mobile-use-starlink-satellites-blanket-us-text.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/95778-t-mobile-use-starlink-satellites-blanket-us-text.html?utm_source=dlvr.it&utm_medium=blogger