Couldn't connect network using external SIM

@salmanfarisvp Glad to help when I can.

Can you capture a trace log by issuing the following requests:

{"req":"card.trace","trace":"+mdmmax","mode":"on"}
{"req":"hub.sync","allow":true}

This will stream a bunch of debug information to the serial terminal.

For more information about generating a debug trace, please review the following: