How do Wifi/Data calls (VoIP) work?

VoIP calls are a Premium feature that lets you make and receive calls over Wifi or mobile data, instead of using your regular mobile (GSM) network.

This feature is especially useful when traveling abroad, as it helps you avoid roaming charges from your carrier.

To activate it: open the Onoff mobile app, tap "Settings", then "Call settings", and enable "Call via Wifi/Data".

This feature is only available from the mobile app and requires a Premium subscription.