Try this (it worked for me with ubuntu 12.04 64 bits):
1) using gedit create a text file with the following commands:
modprobe -r option
modprobe -r usb_wwan
modprobe -r usbserial
modprobe usbserial vendor=0x12d1 product=0x1003
2) save it anywhere (I've saved it as /opt/modem.sh)
3) asign execut permission
4) in a terminal type: sudo gedit /etc/rc.local
5) add the following lines at the end of the file
/opt/modem.sh ## or the path and name you choosed for your
file
exit 0
6) save and exit
7) reboot
8) try your modem
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https://bugs.launchpad.net/bugs/868034
Title:
Huawei E220 and E1550 can't connect on Ubuntu 11.10/12.04
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https://bugs.launchpad.net/modemmanager/+bug/868034/+subscriptions
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