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VoLTE and VoWiFi don't work on o2/Telefónica Germany

 Neither of the options show up in the 'Settings' app.
The 'Test' app accessible by dialing *#*#4636#*#* shows 'IMS not registered' and all of the options regarding VoLTE or VoWiFi are greyed out and cannot be enabled.

o2 Germany says that this is an issue on Nokia's side and that Nokia needs to ship a 'Carrier Config' for their network, so the phone can connect to IMS services.

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