Generally linux does not support many pci modems.
Also, if I'm not mistaken they had to remove alot of legacy kernel modules with the leap from kernel 2.4 to 2.6, because of something (I don't quite remember) not being compatible.
But... You could try ndiswrapper, wich makes it possible to use windows drivers in linux for networking devices (don't know if it works for modem drivers, but it does for LAN and WLAN).
Also, if I'm not mistaken they had to remove alot of legacy kernel modules with the leap from kernel 2.4 to 2.6, because of something (I don't quite remember) not being compatible.
But... You could try ndiswrapper, wich makes it possible to use windows drivers in linux for networking devices (don't know if it works for modem drivers, but it does for LAN and WLAN).