I've recently tried to get XS4ALL Mobiel UMTS working a GlobeSurfer iCON 7.2 on Ubuntu. This isn't as easy as it should be, so I'm documenting how I did it here.
The device starts in disk mode, which autostarts and installs the driver on Windows. These drivers are useless to us (the option driver is available in the default Ubuntu kernel), and the device won't do serial things unless it's "switched" to serial mode.
To do this, you need to download usb_modeswitch</