Just to add, while technically it's 4G, it's hard to rely on that and most of the time the speed I get is less than 2-3mbps and the connection is really unstable(lived in multiple places all across India). It was much better when jio was just launched due to less users. But now it has become race to the bottom and there is no way to get a good 4G connection in India.
At least where I live (or honestly wherever I've been in South India) Jio has been mostly reliable enough for me to even work remotely with zoom calls and ssh/slack. So YMMV is the real conclusion.
I have definitely worked on Jio's network without issues. But have also been to areas where it is patchy. But things have definitely improved in terms of both data plans and their speeds ever since jio came into the market.