I can't make wifi calls. I'm using Xfinity Mobile, a Verizon MVNO.
Using stock Android and the Xfinity Mobile sim card I enabled Wi-Fi calling and registered an e911 address, then verified Wi-Fi calling worked.
Installed Graphene OS
Ensured Wi-Fi calling was enabled in Graphene settings and phone app.
When placing a call while connected to Wi-Fi I never see the wi-fi call icon, even with very bad cellular service.
If I enable airplane mode and turn Wi-Fi on and attempt a call I get the error "Turn off airplane mode or connect to a wireless network to make a call"
dialing ##4636## and tapping "Phone Information" shows "wifi calling provisioned" toggle is grey and on. IMS Service Status shows Voice over WiFi: unavailable (I have another pixel 4a on stock Android and GoogleFi, Wifi calling is not provisioned and IMS Status shows Voice over WiFi: unavailable, but it still works, FWIW)
In "Network & Internet" settings under "Calls & SMS" under Wi-Fi calling it says "Xfinity Mobile Make and receive calls over Wi-Fi" but under "SIMs" under "Wi-Fi calling" it says "Call over mobile network" If I tap this "Use Wi-Fi Calling" is toggled on.
In the Phone app in "Call Settings" under "Wi-Fi calling" it says "call over mobile network" but if I tap this "Use Wi-Fi calling" is toggled on.
I've tried restarting my device, toggling the various Wi-Fi calling toggles on and off, and resetting the network and internet settings. I also noticed the 3 toggles are all connected, IE switching one switches all 3, but only the one under "Calls & SMS" ever says "Make and receive calls over Wi-Fi"
Is this an issue with Graphene, my device, or with my carrier?
Are there any US carriers where Wi-Fi calling is known to work?