Comment 5 for bug 1431179

Thanks. The "-3-1.2:1.0" instance name looks fishy. Can you please check whether this enables the modem?

  sudo systemctl start usb_modeswitch@3-1.2:1.0.service

? I'm not entirely sure what usb-modeswitch expects here, but perhaps you can give me the output of "ls -l /var/lib/usb_modeswitch"? That should have some existing IDs.