Comment 2 for bug 959863

From here, the best guess is that ModemManager doesn't see the modem. Normally we should be seeing traces of it being detected in the WifiSyslog file (which is actually just a snapshot of a grep of /var/log/syslog).

Please follow the steps in https://wiki.ubuntu.com/DebuggingNetworkManager#Getting_debug_logs to get debug logs for NetworkManager and ModemManager. For this, what you'll want to do is to enable debugging mode as per the steps in that wiki page when the modem is disconnected; connect the modem, then wait a bit and take a copy of /var/log/syslog to attach to this bug report.

Also, if you've found the command for the option driver on the Internet, have you also tried to connect with that modem using wvdial? Getting the right wvdial settings may help in figuring out important information for ModemManager, such as at least the right ttyUSB port to use.

Reassigning to modemmanager since right now there is no indication that it's detecting the device at all; I'm also opening a 'linux' task since there's an extra ID needed in the option driver, if that's the right driver for that device.