Did you try unpluggin the modem AND restarting computer (actually only
network-manager service needs to be restarted)?

In my case if the modem is still pluggen in (even though the computer
may be rebooted or even swithed off, while still getting +5V power from
the USB port) - it won't connect.

Try to do that (unplug the modem completely from the usb port AND restart 
either network-manager or the computer.
Then check if it helps.

Also, you can monitor /var/log/syslog looking for line that states:
(Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4
claimed port ttyUSBX. If such a line appers - the modem will work OK.

BTW, I checked the same thing in Fedora 16 (but I didn't install updates
to Fedora 16 yet) - same issue.

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https://bugs.launchpad.net/bugs/875455

Title:
  Cannot find Huawei modem (open port) after restart if connection
  wasn't manually dropped - regression since Natty

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