To set caller tune in this application, you have to do recharge of some selected plans mentioned by Airtel.
If you have not registered in the application, then you have to submit the OTP that you get by entering your mobile number.
You can set different Hello Tunes by listening to Preview by choosing your desired Singer or your desired language.
In this app, you also get the option of Voice Search, which is considered much easier than Manual Search.
The validity of the caller tunes that you set with this app will be shown on the screen itself and you can also extend it before it expires.