It looks like Mark Thomas maintained a phone number database up until 2007 or 2023 for many areas in the USA. I guess that could be a basis for starting 'my own' instance of payphone-go, maybe with twilio (or equivalent) to receive the calls.

[0] https://www.payphone-project.com/numbers/usa/ going through the state map feature only shows a subset compared to navigating through the links on this page.

This works because California requires licensing for payphones and Riley was able to FOIA state payphone database. I'm not sure if other states require licenses for payphones.

I second this! I'd love to have this for PA or NJ.