Yes, I used the Telstra Home Dashboard App. There is a 'Map my Wi-Fi' function

It is marked DIV and PRI. I'm not sure. The setup and specs info available from Telstra don't mention them. From my quick Google: customer.cradlepoint.com/s/article/What-does-the-AUX-Antenna-do#:~:text=What%20is%20the%20purpose%20of,and%20predictable%20behavior%20on%20LTE. en.wikipedia.org/wiki/Primary_Rate_Interface#:~:text=The%20Primary%20Rate%20Interface%20(PRI,services%20to%20enterprises%20and%20offices.

Telstra said: NO; then YES; and then I DON'T know and ref to Tech Support. Then YES again, when I spoke with Gaurov in Customer Support and he said YES too. WHY? The New Modem 3 is backwards compatible with the WiFi Booster 2 and should be able to connect using the same process specified for Modem 2 i.e., Placing the WiFi Booster over Modem 3 and pressing the button to connect to the WiFi signal from the Modem 3. I this does not work - Restart and try again. Under the bus moment - Gaurov assured me the ethernet cable connection option will work if the house is ethernet hub cabled (most aren't), but that option would also take away a valuable ethernet port from the Modem 3. I will try to prove the information over the weekend and I will be back to confirm the options that worked.

I never walked into the garage when I was performing the test. Not normally a place I would spend time in needing wifi

No. Still being used