Make free calls from mobile without internet with wheel

Make free calls from your mobile without any internet connection using wheel 
Steps:-
Dial this number
180020802080
Your call will get auto disconnected after few rings and you will get a call back
Speak your name ,friend’s name
And input the friend’s number as per instructions ,and the call will get connected
The call duration will be 2 minutes.

Note:Some operators may not be supported ,Checked&Working perfectly with Tata Docomo,however Aircel is not supporting.