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This post describes how to connect GPRS from mobile phones via bluetooth in Ubuntu. This procedure is explained for Aircel connection. However, the changes that need to be done for Airtel users are mentioned at the end. Similar procedure works for other network service providers as well.

1. First you need to pair your bluetooth enabled mobile with Ubuntu. You can do that by clicking on the bluetooth icon on the top right of the screen. Or you can find it in System->Preferences. 

2. Then, Open a terminal and type: 

$ sdptool search DUN

You should get this
Code:
Searching for DUN on 00:13:FD:CC:F6:5C ...
Service Name: Dial-Up Networking
Service RecHandle: 0x10005
Service Class ID List:
  "Dialup Networking" (0x1103)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 2
Language Base Attr List:
  code_ISO639: 0x454e
  encoding:    0x6a
  base_offset: 0x100
Profile Descriptor List:
  "Dialup Networking" (0x1103)
    Version: 0x0100

3. Note your phones mac address and channel number which is in red.
In my case phone's mac address is 00:13:FD:CC:F6:5C and channel number is 2

4. Next type this command:
 $ sudo gedit  etc/bluetooth/rfcomm.conf

And add the following

Code:
rfcomm0 {
        bind yes;
        device 00:13:FD:CC:F6:5C;
        channel 2;
        comment "Nokia 3230 via Bluetooth";
}

Enter your phones's mac address and channel number
save and exit.

5. now test the connection by following commands

Code:
$ sudo rfcomm release 0
$ sudo rfcomm connect 0
After a delay you will get the following

Code:
Connected /dev/rfcomm0 to 00:13:FD:CC:F6:5C on channel 2
Press CTRL-C for hangup
Now you have data connection to your phone!.
Press ctrl+C to break connection.

6. Now we have to setup ppp. In my case service provider is Aircel, Type in

Code:
$ sudo gedit /etc/ppp/peers/aircel
And enter the following

Code:
# Aircel PPP initialisation/termination script
noauth
connect "/usr/sbin/chat -v -f /etc/chatscripts/aircel-connect"
disconnect "/usr/sbin/chat -v -f /etc/chatscripts/aircel-disconnect"
silent
debug
/dev/rfcomm0
115200
defaultroute
usepeerdns
Save and exit

7. Now type in

Code:
$ sudo gedit /etc/chatscripts/aircel-connect
Enter the following

Code:
# Aircel PPP CONNECT script
TIMEOUT         5
ECHO            ON
ABORT           '\nBUSY\r'
ABORT           '\nERROR\r'
ABORT           '\nNO ANSWER\r'
ABORT           '\nNO CARRIER\r'
ABORT           '\nNO DIALTONE\r'
ABORT           '\nRINGING\r\n\r\nRINGING\r'
''              \rAT
TIMEOUT         12

OK              ATE1
OK              'AT+cgdcont=1,"IP","aircelgprs"'
OK              ATD*99***1#
Note- In place of aircelgprs you have to put in your APN.
Now save and exit.

8. Now type in

Code:
$ sudo gedit /etc/chatscripts/aircel-disconnect
And enter the following

Code:
# Aircel PPP DISCONNECT script
ABORT        "BUSY"        
ABORT        "ERROR"        
ABORT        "NO DIALTONE"    
SAY        "\nSending break to the modem\n"    
""        "\K"        
""        "\K"        
""        "\K"        
""        "+++ATH"    
""        "+++ATH"    
""        "+++ATH"    
SAY        "\nPDP context detached\n"
Save and exit.

Now we are ready to connect to internet! for first time

9. Open terminal and type in

Code:
$ sudo rfcomm connect 0
Don't close this terminal and open another terminal

Code:
$ sudo pon aircel
Congratulation now your phone must be connected to internet verify it by GPRS icon in your phone.
Now bring up firefox and hit any site.

10. To disconnect from internet type this in same terminal as where you typed pon aircel

Code:
$ sudo poff aircel

For Airtel users, just replace the word 'aircel' to 'airtel' everywhere in this post. And enter suitable APN in the PPP connect script mentioned above. For Airtel it would be AT+CGDCONT=1,"IP","airtelgprs.com","",0,0. Or simply, airtelgprs.com for Nokia users.

Please comment if you have problems.