Now you can get Airtel free NOP Rechaerge in your airtel connection for Rs 13 and here how it is done..
First of all you need tp Recharge Rs 13 and you use your exisiting NOP setting and switch off your mobile and nest day you change your SIM in another mobile set
and Then you Request For a new Setting and now you will get it free for minimum of 1 Year
but try this after 10 AM and now Enjoy Free NOP in your same AIRTEL connection