1.  In /etc/bluetooth/rfcomm.conf, add
        rfcomm0 {
                bind yes;
                device 00:16:B8:9C:8D:4D;
                channel 2;
                comment "GPRS";
        }
2.  /etc/init.d/bluetooth restart

3.  Right-click K Menu => Menu Editor
      Internet => Internet Dial-Up Tool (KPPP)
        Run as a different user: enabled
        Username: root
      File => Save
      File => Quit

4.  K Menu => Internet => KPPP => Configure...
5.  Modems => New... => Device
      Modem name: k800i
      Modem device: /dev/rfcomm0
      Flow control: Hardware (CRTSCTS)
      Line termination: CR
      Connection speed: 921600
      OK
6.  Accounts => New... => Manual Setup => Dial
      Connection name: TMobileInternet
      Add... => *99***2# => OK
      Authentication: Script-based
      OK
7.  OK
8.  Connect to: TMobileInternet
9.  Connect

Other useful items:
    sdptool browse 00:16:b8:9c:8d:4d
    hcitool scan