Spent a bit of time to configure my Nokia mobile to teethering wih my Linux and T-Mobile. Here is some steps that may help the others :

• If you don’t have that blue bluetooth led switched on on your Dell Latitude D630 Laptop you have to enable it. I haven’t find any way to do that via the Linux Kernel module but with Windows under Vmware Player (3.0) enabling Bluetooth and installing the driver (manually not via the setup.exe) enabled bluetooth.
• Switched on bluetooth on the Phone and attached to the laptop via gnome bluetooth applet thingy.
• Get my phone device number from hcitool scan.
• And did this (as root) :

cat </etc/bluetooth/rfcomm.conf

# RFCOMM configuration file.

rfcomm0 {
# Automatically bind the device at startup
bind yes;

# Bluetooth address of the device
device YOUR:PHONE:DEVICE:NUMBER;

# RFCOMM channel for the connection
channel 4;

# Description of the connection
comment “Nokia N95”;
}
EOF

/etc/init.d/bluetooth restart

cat </etc/ppp/chat-tmobile
ABORT BUSY
ABORT ‘NO CARRIER’
ABORT ‘NO ANSWER’
ABORT ERROR
REPORT CONNECT
SAY ‘Calling t-mobile…\n’
"" ‘ATZ’
OK ‘ATE0V1&D2&C1S0=0+IFC=2,2’
SAY ‘Modem reset.\n’
SAY ‘Setting APN…’
OK ‘AT+cgdcont=1,“IP”,“general.t-mobile.uk”’
SAY ‘APN set\n’
SAY ‘Dialling…\n’
OK ‘ATDT*99#’
TIMEOUT 30
CONNECT ""
EOF

cat </etc/ppp/peers/t-mobile
/dev/rfcomm0
460800
idle 7200
modem
noauth
lock
crtscts
defaultroute
user “user”
password “pass”
noipdefault
usepeerdns
updetach
noccp
nobsdcomp
#novj
ipcp-restart 10
ipcp-accept-local
ipcp-accept-remote
lcp-echo-interval 65535
lcp-echo-failure 10
lcp-max-configure 10
connect “/usr/sbin/chat -v -f /etc/ppp/chat-tmobile”
EOF

Under Debian distros you can enable the connection with the command ‘pon t-mobile’ or you for the others can do via the manual way with the command ‘pppd call t-mobile’.