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I am using the XZ with O2 in Germany. I have activated Wifi Calling and usually it is working fine.
However after a day or so Wifi Calling Symbol just won't come on anymore. It seems like some internal service is crashed.
After rebooting the phone Wifi Calling does work again.
Of course rebooting the phone every time is quite inconvenient. Does anyone have an idea which process is responsible for Wifi Calling?
Maybe it would be sufficient to restart this service.
Thanks for your ideas!
I'm in exactly the same predicament as you are or were. Have you found a solution to your problem?