In next stage I have bound the device id with the named device /dev/rfcomm0 using the command rfcomm
The command I have issued is....
rfcomm bind /dev/rfcomm0 00:0d:92:31:66:0d
In the third or last stage I have change the value of Modem directive in /etc/wvdial.conf file.
Modem = /dev/rfcomm0
New my job is complete. After these steps now I can connect internet using wvdial through bluetooth enabled mobile phone.