On April 7th RBI regulator said it will give entities three months to unwind their business relationships. In view of the associated risks, it has been decided that, with immediate effect, entities regulated by RBI shall not deal with or provide services to any individual or business entities dealing with or settling virtual currencies.
Regulated entities which already provide such services shall exit the relationship within a specified time.
It's not illegal for the consumer to use or buy/sell bitcoin at all.
All this means is that most commercial banks will essentially be forced to stopping co-operation with crypto exchanges that hold an account with them. That's pretty much it at this stage. There are unconfirmed rumors of the government wanting to implement a VAT on top of crypto trading, but that is obviously unconfirmed.
In fact, it's not even illegal based on my understand that banks continue to serve crypto businesses. It's just that they'll risk delicensing from the RBI, which is something that nobody wants.
Trading p2p should prove to be the go-to way to trade in India after this restriction is put in place. It's definitely not illegal for you to trade on localbitcoins still.