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@Guest, I have just read this long post again to understand the problem.

I don’t know how you tried. But let’s do this once again using same configuration.

First, use ttyUSB2 to send command and use ttyUSB3 for network "option device ‘/dev/ttyUSB3’, I bet your apn setting is correct.

Second, unplug power, then plug power again. If you tried to connect before, a software reboot may not correct the problem.

Third, after the system boot, let’s check network and try AT command. You can just try “comgt” simply to check if you have any luck. Then you can try the AT command one by one from the quick guide to get the output. Next pls post your log.