I have been using jio from november 2016. Jio is slow since I m using this. Jio is not so fast, speed comes from 500kb to 1 mb only but he has to give speed upto 40 to 50 mbps because 4G network speed is so fast. But jio is not giving proper speed. Dont know why jio dont give full speed. And now about calls first of all when jio is free, everycall is busy. But when jio started paid service still no any improvement in jio. And jio stops another sim network if you are using 2 sims this is the very bad thing of jio.