You might like to add
"Emergency Plus app
Install the Australian Emergency Services Triple Zero (000) app: Emergency Plus. All group members should have this App installed on their mobile phone. The App screen provides the location, which can be passed on to the 000 operator.
- Emergency Plus – Google Play
- Emergency Plus – Apple App Store
"
000 works via any network not just your own provider as well JT. Take your sim card out and it may still call 000[thumbsupbig]
That may mean even if your network is off another may connect you to emergency.
The Whatsapp and VIOP services can connect so as Dave (Blacknight) pointed out. Home WIFI required of course for that!
A PLB might be another cheap option and they work anywhere! I have a EPIRB in my boat for use if needed a LONG way away from land.

