Linux : Ubuntu 6.06 Dapper Drake
GSM : XL Xplore
Mobile : Sony Ericsson T610
using Bluetooth (Dial Up Network/DUN) service

Create new file /etc/ppp/peers/xlgprs

connect "/usr/sbin/chat -v -f /etc/chatscripts/xlgprs"
usepeerdns
noauth
defaultroute
noipdefault
nocrtscts
nocdtrcts
modem
/dev/rfcomm0
115200
user "xlgprs"

File /etc/ppp/pap-secrets, add this line at the end of the file.

"xlgprs" * "proxl"

Create new file /etc/chatscripts/xlgprs

TIMEOUT 60
ABORT ERROR
ABORT BUSY
ABORT VOICE
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "NO DIAL TONE"
ABORT "NO ANSWER"
"" "ATZ"
"" "AT&FH0M0"
OK AT+cgdcont=1,"IP","www.xlgprs.net"
OK-AT-OK "ATDT*99***1#"
TIMEOUT 75
CONNECT

"AT&FH0M0" is specific for SE T610.

Prepare your bluetooth connection, so your computer can see your SE T610.
Some commands need root priviledge.
Search for device and channel for Dial-Up Network.

$ sdptool search DUN

In my case, the device is 00:0F:DE:04:6F:0E
and the channel is 1.

We'll use rfcomm0 . So release old connection, if any.

$ rfcomm release 0

Bind the device, use sdptool's result.

$ rfcomm bind 0 00:0F:DE:04:6F:0E 1 

Next, we need to pair your computer and your SE T610.
Well, I don't know how to do it better. Please advice ....
But we need to open xhost security.

$ xhost +

Place the PIN at the handset.
Match the Bluetooth PIN at the Ubuntu.

$ cat < /dev/rfcomm0

Control-C to back to prompt.
Then close the X security.

$ xhost -

Then call the pppd

$ pppd call xlgprs

Happy surfing ....