This issue happens in Ubuntu and any Linux based system. Download and install the following packages.
usb-modeswitch-data - http://packages.debian.org/squeeze/usb-modeswitch-data
usb-modeswitch - http://packages.debian.org/squeeze/usb-modeswitch
Download the .deb files and use :
sudo dpkg -i FIRST_PACKAGE.DEB
sudo dpkg -i SECOND_PACKAGE.DEB
Once you complete this, the system will recognize your device as being a USB data modem.