Smart modem on Advance Mobile "no device connected" and lost Yellow Signal light

[danylo]

After my NBN started and  a month of normal operation on HFC NBN, the yellow "Signal" light  on the smart modem become dark and no way in Advance and other settings to make any changes.

There is only one message " No device connected" Tried to connect to it externals antennas but it does't  help. Looks like internal Sim was deactivated. Telstra 4G  is in my area and one month (or more) it worked. Possible modem malfunction.

The result there is no mobile internet connection in case when NBN stops working. 

And  an important part of the service is lost.  Official complaint was sent.

What else can be done? Thanks

Google Translation

[cf4]

You could try factory resetting the modem by pressing the reset button located below the power button for at least 10 seconds. Modem should reboot resetting all settings to factory defaults.

[danylo]

Did resets several times. It don't help. There is no any Mobile Signal light -green, yellow or red just blank. My complaint  SR 1-1698190689160 about this problem without any response. But 5 days not passed. Will wait.

Google Translation

[343GuiltySpark]

Is the sim card on the bottom of the modem snugly inserted. Its hidden behind a white sticker

[danylo]

Yes, it worked about a month. When my NBN started there was a yellow light and I checked this service. Was no problems. When it stopped I don't know exactly.

Google Translation

[cvee72]

This exact thing is happening to me.
Works for a while... then the smartmodem reboot itself and after startup.... the 4g connection stops working and shows No Device Connected.

Last time i did a factory reset which didn’t fix it.. but a reboot after reset did.
That’s not consistent since it doesn’t always work.

Has happened again today..... but dont won’t to factory reset.
I think pressing the on/off button on the smartmodem May also have fixed it once before.

Anyone have more info on this issue?
At what point do I log a fault with the hardware?

[Cas-Ra]

Hi @cvee72 I'd recommend giving tech support a go if you're having ongoing issues with your primary connection or the 4G back-up. You can chat here:  http://tel.st/4resc , or call 133 933 for Cable or ADSL, 1800 TFIBRE for NBN which are all available 24x7, and we can take a look for you