I used the grey modem which wasn't compactible with Linux because it uses a different product ID (1012) than the blue version.
I use a 2.4.25 with the UNICORN drivers 0.8.7 :
Kernel config :
/Networking Options
/ATM [M]
/Networking Device Support :
/PPP [M]
PPP FILTER [Y]
PPP ASYNC [M]
PPP SYNC_TTY [M]
PPP DEFLATE [M]
BSD COMP [M]
PPPOATM [M]
PPPD Configuration :
/etc/ppp/options
user [ login@provider ]
lock
kdebug 1
ipparam ppp0
noipdefault
noauth
default-asyncmap
usepeerdns
defaultroute
hide-password
noaccomp
noccp
nobsdcomp
nodeflate
nopcomp
novj
novjccomp
lcp-echo-interval 20
lcp-echo-failure 3
sync
maxfail 0
persist
plugin /usr/lib/pppd/plugins/pppoatm.so [vpi.vci] #8.35 for TELE2
[ French version ->
http://lea-linux.org/hardware/modem_bewan_usb_st.html ]
Nicolas Hourdeau