FYI, I had a similar problem. After many hours I got my 3g card working.
For those of you using usbserial driver, there is a udev rule that prevents nm-modem-probe being executed to add ID_NM_MODEM_GSM=1
ID_NM_MODEM_PROBED=1
to your ttyUSB device info.
I got around this by modifying the rule to remove the checks based on driver. For some reason usbserial isn't in the list.
FYI, I had a similar problem. After many hours I got my 3g card working.
For those of you using usbserial driver, there is a udev rule that prevents nm-modem-probe being executed to add ID_NM_MODEM_GSM=1 PROBED= 1
ID_NM_MODEM_
to your ttyUSB device info.
I got around this by modifying the rule to remove the checks based on driver. For some reason usbserial isn't in the list.
/lib/udev/ rules.d/ 77-nm-probe- modem-capabilit ies.rules