Quickly, from the NetworkManager logs, I'd tentatively say that the modem can't find signal; but there's too little information to be able to know for sure.
Can you please provide debugging logs for ModemManager, see http://wiki.ubuntu.com/DebuggingNetworkManager for how you can get these logs.
Reassigning to modemmanager since that's what seems to be the culprit.
Quickly, from the NetworkManager logs, I'd tentatively say that the modem can't find signal; but there's too little information to be able to know for sure.
Can you please provide debugging logs for ModemManager, see http:// wiki.ubuntu. com/DebuggingNe tworkManager for how you can get these logs.
Reassigning to modemmanager since that's what seems to be the culprit.