From the link I posted:
Suse 7.1 Netcomm USB Roadster external modem.
Requirements that I can think of include
Kernel support for USB- I use the USB -"uhci" module.
Kernel support for a modem driver - I use the "ACM" module.
Use /var/log/messages to monitor the installation.
In Wvdial I use the link
/dev/modem -> /dev/ttyACM0
Open an x terminal and make sure the modules are loaded:
fancy@uilleann $ su -
root@uilleann # lsmod
Module Size Used by Not tainted
hid 21344 0 (unused)
input 5984 0 [mousedev hid]
ehci-hcd 19520 0 (unused)
usb-uhci 24452 0 (unused)
usb-ohci 20736 0 (unused)
usbcore 73216 1 [hid ehci-hcd usb-uhci usb-ohci]
Make sure those modules are loaded as well as the "ACM" module
module (sorry, I can't tell you how to load it as I have never used it) mentioned.
Make a symbolic link from the device to one called modem
root@uilleann # ln -s /dev/ttyACM0 /dev/modem
If everything is loaded correctly, you should be able to connect using /dev/modem or /dev/ttyACM0