1. Open a terminal
2. Install udev-extras from the standard Ubuntu repositories:
sudo apt-get update && sudo apt-get install udev-extras
or
sudo apt-get update && sudo apt-get install udev
3. Add a custom udev rule for the Huawei E1550 by typing this line:
echo 'SUBSYSTEM=="usb", SYSFS{idProduct}=="1446", SYSFS{idVendor}=="12d1", RUN+="/lib/udev/modem-modeswitch --vendor 0x12d1 --product 0x1446 --type option-zerocd"' | sudo tee /etc/udev/rules.d/45-huawei1550.rules
4. Configure the Mobile Broadband on Network Manager. (right mouse the Network icon near the volume icon).
5. Select Mobile Boardband -> Add
6. After added, restart the pc.
7. Cheers...
