I am really happy with the jio sim.
I got my jio sim 5 days ago. from reliance gallery. The representative gave me fast 4g internet card within 5minutes and the 4g service started within 6 hours.
Really best 4g speed it downloads fast.
I got the reliance jio preview offer i.e. Is for 3 months unlimited calling and data.
The download speed is just awesome and doesn't have lags or break down in between. But the call quality is ok! Sometime the calls also doesn't connect directly. After 4 to 5 attempts the calls are connected.
Anyways doesn't matters as it is unlimited. Free is free.
Thanks to the Reliance Jio owner.