Jio provides caller tune service for its customers absolutely free. It is called JioTune. Jio users can enjoy free caller tune service for 30 days once activated.How to activate JioTune
Through SMS
Send "Movie name / Album name / Singer name" and send it to 56789 [Toll free]
As shown in below picture (e.g. if you want to set a song from movie "befikre" as your JioTune)
Through JioMusic app
You can also set your JioTune through JioMusic app while listening to a song press on "Set as JioTune"
Some tips
Change JioTune : Repeat the process once again
Stop JioTune service : Send a text "STOP to 56789" and it will be deactivated immediately
Copy JioTune : Press "*" while listening to a JioTune and then reply the text received with "Y" to confirm