Here is the Trick For AirTel Customers to Activate free callrate Reducing Offer.

 Airtel-Airtel=30ps/min,Other=40ps/min,STD=50ps/min. 

To activate this Trick dial: 51570(free) then select language then press 1.

 Offer activated successfully. Enjoy it before they block this offer.. 

(working only in some states)