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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