To enable Wi-Fi Calling
Settings>Mobile and Internet>Mobile Data>SIM 1 or SIM 2>Calling>Wi-Fi Calling
Remember that this option only available when the network operator adds this device under Wi-Fi calling eligible devices
For Indian Users: Go to these web sites and check whether devices are in list or not
Jio : https://www.jio.com/en-in/jio-wifi-calling
Airtel : https://www.airtel.in/wifi-calling
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