From my experience I'd coclude that the latest pcmcia modem cards aren't supported by linux or atleast kernel 2.4.......maybe 2.6 will support them.
My OPTION FUSION card hasn't worked under a number of linux distributions I tried.
The older Novatel works great though.
My OPTION FUSION is a wireless card aswell as a modem which is why I initially favoured this card but maybe this confused linux OS on what drivers to associate with the card somehow..............just a guess!!
Orange only use OPTION FUSION now, not Novatel cards.