could you please connect it and open konsole? write lsusb and post the results, it could help us to detect the exact model of the device
open pclinux control center/hardware/browse and configure hardware
on what section is detected there? what module has it loaded, unknown perhaps?
some modems are detected directly by the kernel and in those cases all you need to do is use kppp or use umtsmon(depends on the modem) or open pclinux control center/network and internet/setup a new network interface/3G