How to Activate Airtel hello Tune

The follwoing is the method to activate free hello tune in airtel.but using this number you cannot select your own song but only what they provide.but any way you get a free hello tune.

AIRTEL FREE HELLOTONE
(Activate)
dial
543211888 (toll Free)
(Deactivate)
Dial
543211808 (toll Free)

enjoy airtel hello tune!