JUNO isn't free but is less than most and contrary to what their tech people
say it does work fine with Linux.

It offers 10 hours FREE per month........

Where are you USA or UK?

Ticali.com still offer a dial-up service.

Here in the UK there are not many left but www.free-dialup.net just
gives you a phone number and password and your online.

Dial-up works with all linux versions if you have a modem