I have been a graphene OS user for the past 3 years. Everything was working. Recently, I switched to a new carrier (Jio - India). I am able to use mobile data, but calls are not connecting. Contacted customer support by visiting local Jio store and they said my device doesn't support VoLTE!
Pixel 6A definitely support VoLTE. But it is not working with Graphene OS. Tried force overriding carrier settings, tried IMS APN settings. None of them worked.
Please let me know if there's a fix for this issue. I have seen other graphene users using the same sim with 6A running graphene without any issues - so, definitely, there's a fix.