Any modem with a serial port will interface with a Pico - they normally adjust to any standard baud rate, so speed isn't a problem. Then its "just" a matter of sending the right commands.If you can't find an old modem you can buy a "new" one:
https://www.aliexpress.com/item/1005007137137398.html
Not sure how well they'll work with a Pi, probably not at all with a Pico.
Statistics: Posted by stevend — Fri Nov 22, 2024 1:37 pm