Was this helpful?
It could be a faulty SIM or the SIM. You could try a factory reset of modem. If still not working ring support and report a fault.
The 4G back only connects if main link is down. If you have a Gen 2 modem the mobile mode only turns green if main link is disconnected.
On Technicolor modem if you log in and go to Advanced > Mobile this is what you should see.
On the Arcadyan if you log into modem and go to Advanced > Internet > LTE this is what you should see.
Have you contacted support? It looks like the SIM card has probably been incorrectly provisioned in the modem. I don't know of any settings in the modem that will fix the problem. Will probably need a modem or SIM card replacement.
See section 25 of document link at the end of this post for normal state of the 4G backup when main link is working.
Yep contacted support and got the " that is normal, and when there is no NBN, if it is not working, let us know...)
I`ll leave it broken, is too draining interacting with "support"
You can simulate the NBN not working by disconnecting the modem's DSL port (FTTN and FTTB) or the WAN port for other types of NBN connections. If 4 G doesn't start working after 5 minutes then 4 G backup on modem is faulty. If you point this out to support and they still say 4 G is working as it should lodge a complaint. You can lodge a complaint by ringing 132200 and when asked for reason say complaint or use online form at link below.