I’m using jio since last month. Sometimes I’m just feeling irritated with the speed, but sometimes felling really good. You get a usgae limit of 4gb with unlimited speed ( which is max upto 3 or 4mbps on my device) per day. I mostly use jio with hotspot on so that my family can use it too. About calling, its just average. You really can’t get connected to other person with a single call. You’ll have to try 3-5 times and sometime 10+ . Besides, if you’re going to call on jio number, it will connect with a single call. But overall its a free service till 31st december. So enjoy it without any complaint.