Hello, I have installed GrapheneOS yesterday on my Pixel 5 and discovered that I can't make calls half an hour ago. Whenever I try to call somebody the call-screen opens, almost immediately shows 'call ended' and closes afterwards.
This happens no matter who I try to call, I have tried calling via WiFi, turning roaming on and off and also downloading a non-stock dialer. None of this helped.
Do you have an idea about this? Any help would be appreciated.