first thing u need to do is make sure u do not have a winmodem.. win modems only work with windoze
go to the suse site and check for compatibility of your modem type.. of corse u may have already done this.
If u have a win modem u will have to replace it with a non win modem befor u will be able to get on line.
do a search on dogpile ( www.dogpile.com ) on " winmodems and linux "...
I hope this helped