1) service NetworkManager stop
2) killall -TERM modem-manager
3) modem-manager --debug
4) service NetworkManager start (in another window)
5) unplug and replug your device, try to reproduce the problem where the modem is not seen by NM
6) when you reproduce the problem, attach/paste the modem-manager output here and we can see what's going on with modem detection
Can you do the following for me?
1) service NetworkManager stop
2) killall -TERM modem-manager
3) modem-manager --debug
4) service NetworkManager start (in another window)
5) unplug and replug your device, try to reproduce the problem where the modem is not seen by NM
6) when you reproduce the problem, attach/paste the modem-manager output here and we can see what's going on with modem detection