If your mobile device is updated to the latest software version, VoLTE will be automatically activated. If it's not, you can also manually activate it as below:
iOS: Go to “Settings” > select “Mobile Data” > select “Mobile Data Options” > select “Voice & Data” > Select “4G” > switch on “VoLTE” slider
Android: Go to “Settings” > select “Connections” > select “Mobile Networks” > switch on “VoLTE calls” slider
(Note: May differ according to your mobile device model. If you’d like to switch off VoLTE, this can be achieved with the same steps above.)
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