I don't know if it's still there, but there was a free payphone years ago (the no-pay phone) in an inconspicuous spot in the tiny town of Gerlach, Nevada and you could call anywhere in the world on it, back when that still kind of meant something.

Seems like an odd place to find it, but Gerlach is surprisingly connected for a remote desert town. It's the town closest to where Burning Man is held every year so thousands of tech types pass through and have a particular fondness for the area. Some have settled there, and lots of people have worked to bring solar power and internet to the NV 447 corridor.

If you've watched the movie Nomadland, the town of Empire where the main character starts out is a few miles away.