Communicator
Video calls
Full control over end device
Open source
LTE/4G
Links
https://lineageos.org/
https://forum.xda-developers.com/
https://wiki.lineageos.org/devices/
https://github.com/jitsi/lib-jitsi-meet
https://github.com/jitsi/lib-jitsi-meet/tree/master/doc/example
https://community.jitsi.org/t/rest-api-for-meeting-management/24357