Thanks, I previously set VoLTE on (it didn’t work) and my cellphone provider is telling me that my phone does not support my phone and I will have to use a different phone (actually modem of course) by the end of Feb 2022. T-Mobile apparently is supported, but when I tried in the past the signal was not strong enough at my home (or my previous workplace). Without WiFi calling as an alternative, I would not have a way to make or receive calls except with XMPP or SIP calling. I have SIP calling working with jmp.chat using gnome-calls. I have not gotten any other calling app to work (I have tried many).
Thanks for the suggestions though.