Yes, emergency triple zero calls are supported over Wi-Fi Calling if there is no mobile network coverage available to make the call, if you have Wi-Fi coverage and are using a Wi-Fi Calling compatible device with the latest software.

If Optus mobile coverage is insufficient to make the call your device will then automatically search for other mobile carrier networks to try to make the call.

Emergency services will ask for your location when they answer your triple zero call when using Wi-Fi Calling as it may not automatically provide your current location.

Wi-Fi Calling service is unable to receive National Emergency Warning System (NEWS) SMS warnings.