An interesting article on Jio from The Economist:
http://www.economist.com/news/business/21718495-jios-100m-ne...
By their math, acquiring those 100 million customers cost 25 billion USD. The writer is sceptical that Jio will ever make that money back.
Personally I think it's awesome that an Indian billionaire is spending his money on local digital infrastructure. Even if Jio doesn't become hugely profitable, its network seems to be a boon to India.