I have not been able to get my new GX440 to function. I have followed the manual by wiring the power cord, inserting am AT&T SIM, and connecting 4G antennas. I am able to talk to the interface on :9191, no problem.
However, the signal light blinks red, and the network light blinks green forever, even though I am in a strong signal area.
When I look at the interface for WAN/LTE, it shows a phone number I am not familiar with, not the one in my SIM. This SIM works fine in my USB dongle…
Have I missed a required setup step to connect to the AT&T network?