Just set up a nice system at my grandma’s house and am having trouble with the Cerbo connecting to VRM when using the GX LTE modem. It is working fine off a hotspot from my phone over wifi, but I am getting error codes, either 152 or 153 when I turn the hotspot off and try to connect over LTE. Inside the Cerbo console I can see I have full bars and it says it’s ready and online in the gsm menu, light on the modem is blinking rapidly like it should. The sixfab sim card came out of another modem hooked to a different Cerbo at my house, so I know it works. It seems to me that the problem is not in the modem but in some setting in the Cerbo I am not aware of. Please help, I have to leave my grandma’s in a few days and I won’t be able to make it back here for a few months 
Try switch off https connections. We find we have to do that for mobile data connections sometimes
I feel like this was the fix. I did this after posting and came back to check it a few hours later and voila, it’s connected to VRM and remote console via VRM is working as well. It’s been up for over 12 hours now, so I’m feeling pretty good about it. Thank you so much for the info 