Hi friends,this is an special offer for airtel customers to call free from airtel to airtel free of cost for 100 minutes any time in a day.this is an service provided by an website called beep.download a small application to your mobile phone and activate it and now you can use the free calls.to download click the link below
>http://wap.beepindia.com/beep.php
once you download enter your and your friends airtel no. and call free.