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How do I know if call is over mobile or internet connection?

When placing a call you will see the application call window with sign “Wi-Fi” in the top corner.

If you cannot reach the desired caller via app you will be switched to cellular call and notified by the app.

You can force the calling over the application in the menu Carnegie and clicking SETTINGS and then CALLS. Move the “Force VoIP call” slider to the right Carnegie to enable that all call via VoIP and application