Please tell us some basic information before asking for help:
Model Name: ROG 3
Firmware Version: 17.0823.2012.182
Rooted or not: Not
Frequency of Occurrence: regular
APP Name & APP Version (If your issue relates to the app):
December Update and you still couldn't enable VoWifi for Airtel?? My other older phone Honor V10 has had it for months now.
If you don't want to give the VoWifi on Airtel, just announce it.