First - I have NO personal experience with this device.
However there is a long thread about this device at http://ubuntu-utah.ubuntuforums.org/....php?t=1017630
The good news is that there are entries for this device in /lib/udev/rules.d/40-usb_modeswitch.rules and /etc/usb_modeswitch.d/19d2:2000 in Slackware64-13.1
I would try using kppp with *99# as the number to dial. You may have to try different devices ttyUSBx (where x is a number likely to be 0 to 3) for the modem until you actually find the modem port. The output of 'dmesg' will help with finding the correct device name.
Also you will need to provide information from your ISP about your connection (such as username, password, connection method) to kppp.
Good luck with this! I know I had a battle getting a USB modem working for a friend of mine but got there in the end.