Jio comes bundled with value added free services like JioTV, JioCinema, JioMagazine, JioMusic(JioSaavn now) and bunch of other apps.
India is a price sensitive market and hence Jio would keep prices lower for as long as possible to keep other players out. Jio is already posting profits.
They are in it for the long game. The bottomline is that prices may not go up anytime soon.