I friends I am using Jio sim card from 2 months . When I started using it it’s speed was just awesome .I would just wait for few seconds till the download or upload finishes. But today the networks are so jammed that one hardly gets 4 g speed. Also the calling system is not yet working finely .we are not able to call on sims like idea, docomo and more.this could be because many people have chosen this network and Jio team maybe working on this issue but after all it’s free network so we should not blame them for this because we actually are not paying for it.