Yes, Bitcoin mining is illegal in india but bitcoin trading is legal, as RBI already stated that anyone using or trading bitcoins do at their own risk. As RBI states they will not support any virtual currency in india. So here the peoples can do at their own risk.
And Nishith Desai Associates are saying that according to some points in india law firm bitcoin is legal. But finance minister in india said that the bitcoins are not legal and they are scam and BJP MP Kirit Somaiya has filled an case in parliament about bitcoin is illegal in india.
So Investors/Buyers/Traders/Sellers you can do at your own risk (BITCOIN will be a Money god in future) :))