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Network/Connectivity VoLTE, WiFi Calling not available OnePlus 7 Jan 15, 2021

Nikhil_ads , Jan 15, 2021 :

I am using the OnePlus 7 dual SIM mobile. I have a SIM with WiFiCalling enabled. I tried to enable WiFi calling through the SIM settings but no option is not available. I tried *#800# which takes me to OnePlus Log kit -> switch function. But that too does not have an option to enable VoLTE and WiFi calling. (Please check the screenshots attached)

I also tried *#*#4636#*#* and checked Phone information and found that VoLTE provisioned is disabled and I cannot be enabled. Even WiFi calling provisioned is disabled and cannot be enabled

My SIM is WIFI enabled 100%. Can someone please help?

Thank you
Nikhil