JMP Chat is an XMPP based sms/call solution, with the latest change allows calls to be made over Jingle (incoming calls via Jingle were already working prior).

This means if you're using a supported XMPP client (Movim, Gajim, Converations) you can do calls and sms all without needing a SIM card or traditional carrier plan. Calls also work over SIP using an application of your choice, however it's nice to handle calls and messaging in one location.

FAQ for the project: https://jmp.chat/

General support room: discuss@conference.soprani.ca

I used this on the PinePhone to get around the lack of MMS support, and am excited to see where else this project goes (JMP Chat) as updates get released to the Linux phone offerings we have available.