As per telecom services , they earned from customers in very different ways no matter how , may be caller tunes, and so much . So why not we get free premium service . Don't worry here latest hack trick for Airtel users.
Free Miss Calls Alert For Airtel
Just You Dial any below number and a free service will activate
*321*885# Or *321*884# Or*321*882#OR *321*881# Or *321*880#
*Note: I am not responsible for any hack trick failure , because its not permanent .