Wireless and Dial-Up are two different methods of accomplishing the same thing. Therefore, they are basically mutually exclusive. (technically you could use them both at the same time, but in nearly...
The modem on your computer must connect to your Internet Service Provider's server over a land telephone line. You connect the computer's modem to a telephone jack as you would a telephone.
Currently not possible with BSNL dial up connections but you can try to hack Bsnl or Airtel Gprs for Free internet. The Gprs connections have more possiblities than dial up connections. Try...