I am using jio sim for last 6 months and travelled to Pune, Mumbai, Chennai, gujarat, Rajasthan. The speed is amazing. Currently I am getting around 7-8Mbps Download Speed and 6-7Mbps Upload Speed . And I am satisfied with it, because when around 6 million people are active now with jio sim, providing high speed for free is definitely a challenge for any network. Calls are very disappointing. I have 4g phone but then also I have use app calling, it’s frustrating at a times . Normal calling feature is not working and whenever normal call try always said “Network is Busy”. I gave rating overall 3.5/5.