Reliance Jio mobile network is the worst mobile network as I have personally experienced it. It shows weak signal strength at most of the locations in india.Inspite of providing a connectivity speed of 4-5 mbps it provides a speed of 300-400kbps which makes it a worst network.
So If you are going to take a new sim I would suggest you to go for Vodafone which provides the best connectivity speed among all the mobile networks.
I Hope this this review is useful to you.