Install and open the MyJio app
Sign in with your Jio number
Tap the JioTunes or Caller Tune option
Browse or search for a song
Select the song you want
Tap Set as JioTune
Confirm the activation
Wait for the confirmation message from Jio
To set via SMS, send JT to 56789
To set via JioSaavn, open the app and choose Set as JioTune
To deactivate, go to JioTunes in MyJio and turn it off