I’ve been using Jio for some months.
1) How to get - Firstly, there’re some requirements to buy Jio sim card. You must have a 4g Phone and you have to install "My Jio" app in that from play store in order to get a Bar-Code. That bar code you will have to show to the Jio-retailer and from there you can get a sim card. However, due to excessive crowd, this process may take time.
2) Internet speed - No joke, almost everyone have bought this to access Internet. Internet speed is generally okay. but don’t surprise because sometimes it gets slower than 2g. Sometimes It just works fine and gives downloading speed upto 2-3 MBPS.
3) Call Drops - It is the issue everyone who has JIO is frustrated with. Jio has a abnormal amount of call drops. Sometimes It just doesn’t connect the call. Reliance Ltd has registered a complain against many other networks saying that other networks are not following the policy which is reducing the internet speed of Jio and increasing the Call drops.
4) Internet Limit - There’s an internet limit which you can’t exceed in one day that is of 4 GB. You can’t use more than 4 GB data in day. So eventually you see Jio does not provide unlimited internet as you may be hoping for.