Indian Realme X2 Pro users will soon be able to use VoWiFi on Reliance Jio and Airtel. The functionality comes via its latest software update which also brings the January security patch. It is rolling out now and will be available to users over the coming week.
https://www.notebookcheck.net/Realme-X2-Pro-gets-VoWiFi-functionality-January-security-patch-and-more-via-latest-update.452517.0.html