I have the same issue on a Max HD2. I have an AT&T SIM in the HD2 from my iPad Pro. The HD2 can see the SIM:
But it’s stuck trying to obtain IP address:
I tried many suggestions in the older threads—anyone have any new info on this? I checked on AT&T’s site if I have to give the SIM some special settings but there’s not much there and the few settings they suggest are not in the Details section for the SIM. Any other ideas?
Does the fact that in my first pic it shows the router knows all the details of my SIM mean that it is connected to AT&T to get that info or is all that info built into the SIM?
Does it matter that my HD2 is older. Warranty date says 2014 and hardware revision is 4. The product/model is MAX-HD2-LTE-E. I’m running the latest 8.1.0 build 4939 firmware.