Is it possible to get a debug print out or something of exactly what a router does when connecting to a 3G modem?
SYSTEM → LOGGING → RULES → ADD
Leave Topics BLANK
Leave Prefix BLANK
ACTION = MEMORY (or whever you want to send it).
This is the full capability of the logging. Leaving Topics and Prefix blank will log every possible thing from the router.
Whatever it shows at this point is all you can get.