How to use "Mobistar Internet Everywhere" with Debian GNU/Linux Lenny

apt-get install wvdial ppp

cat > /etc/wvdial.conf <<EOF
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0

[Dialer mobistar]
Phone = *99***1#
Username = mobistar
Password = mobistar
Stupid mode = 1
EOF

cat >> /etc/network/interfaces <<EOF

#auto ppp0
iface ppp0 inet wvdial
provider mobistar
EOF

ifup ppp0