The duplicate SUBSYSTEM=="tty"... IMPORT{program}="nm-modem-probe" entries as described earlier today.
I tried reverting that change, and setting the delay to 100, 200, 500, 1000, 2000, and 3000, and none of them caused NM to report a GSM modem on ttyUSB0, but it didn't seem likely it would.
The duplicate SUBSYSTEM=="tty"... IMPORT{ program} ="nm-modem- probe" entries as described earlier today.
I tried reverting that change, and setting the delay to 100, 200, 500, 1000, 2000, and 3000, and none of them caused NM to report a GSM modem on ttyUSB0, but it didn't seem likely it would.