hi friends i your balance is low than 1rs then do not worry,Airtel introduce new plans free for airtel users.you can call your friends whether you have low balance than Rs. 1. you have to do following thing to get this trick.

Steps

Step 1 : if you have low balance than Rs. 1 then dial *141#, menu will come on screen

Step 2 : Select Call me back offer[free]


Step 3 : Enter your friends 10 digit mobile number whom you want to talk

Step 4 : new press ok your message will sent to your friend very free.the message contain your request to call you back cause of low balance