Question: what to do if jio tune is not available?
Answer: If the option/button to "Set as JioTune" isn't showing at all, follow the steps below. Connect on your Jio cellular data only (not another network, Jio-Fi, or other Wi-Fi). Tap the (•••) menu to the right of any song, select "Set as JioTune". (If you don't see it, restart your app once.)