Prepaid domestic roaming

Thanks for this interesting information, but my prepaid account doesn't fall into any of those categories. I've also spoken with three T-Mobile support people today and they all said there's no reason why domestic roaming should not be working on my account. Since those guys are hands-on with the network and account configuration details, that supercedes anything in the sales propaganda.

Also, that coverage map is 100% fiction. It shows a friend's house in Illinois as solidly within the "5G Ultra" and "4G LTE" coverage area, and he barely gets a usable signal. He's spending a significant amount of money with them, recently added about $100 add-on international roaming data plans for his work, and with all that, he's getting warning emails that his international roaming is being disabled because he's using it too much data! Obviously, that won't last much longer.

And just for fun, I checked out a neighborhood in Los Angeles where I was working at a client's site, and confirmed there was zero coverage (with my devices in test mode). Got photos of the T-Mobile cell site with the antennas missing in the direction of my client's office (this site only had two sectors). On another day, driving along the pacific coast, I lost coverage (phone and data) along a large portion of Redondo Beach (twice, going and coming back).

The coverage simply doesn't exist. Yet the T-Mobile map shows solid 4G LTE coverage throughout the entire city. Don't mean to be disrespectful on this, but save this map for the newbies.