I'm always looking for a new project with raspberry pi's. Currently trying to build a semi-smart phone with a 2G wavshare modem and some code which was stolen from this project: https://github.com/evanman83/OURS-project
Kinda stuck though as while I can text and call - I can't make the audio work in either direction.
Might be time to give up, and work on setting up a pi-hole at the router. Would love to remove those ads network wide!