Recently I switched to an eligible device for VoWiFi. However, I realized that VoWiFi service on the smartphone is not available. What should I do?

Permanently deleted user

You can check on the below prerequisites:

Ensure that you are VoLTE active
Ensure that your device supports Yoodo VoWiFi service
Ensure your device has been upgraded to the latest firmware
VoLTE is switched ON in the device settings (Steps to enable VoWiFi may differ subject to device models)
Ensure that VoWIFI or ‘Wi-Fi calling’ is enabled on your device