I am using Jio sim for over 3 years and I'm not liking it for several reasons. First of all the internet speed. Sometime it is giving internet speed quite well but suddenly its down. If you moov just few steps the data speed may vary and sometimes its very annoying. The voice calling service is not also good. Sometime line may not connect after trying few times, call ends at the middle of the conversation, call becomes one way and cross connections. Those are the reasons not to like Jio.