[Update on 23 December]:

Indian telecom operator Airtel has launched WiFi calling (Vo-WiFi) services in the national capital of New Delhi today, allowing Airtel subscribers to get access to high-quality calls while indoors using their WiFi networks. The service offers users high clarity indoor calls, faster call connections, and Airtel claims that it will also offer crystal clear audio quality in calls.

List of Compatible Smartphones

Airtel has released a complete list of smartphones compatible with Airtel’s VoWiFi service:

How to Enable Airtel WiFi Calling

If your smartphone supports VoWiFi calling, and you’re using Airtel’s Broadband, or Xstream Fibre network in your home, here is how you can enable Airtel WiFi calling on your smartphone right away.

Once you’re done, just restart your phone and you should see a VoWiFi symbol in the status bar of your device.