I have a jio sim. this provide free internet service, calling, and sms for 3 months . the network coverage is not that much good. in some places the network is not available. it provides good facility to the customer like apps jio tv jio music etc. these apps are very usefull. there is only one drawback of this sim that it does not connect calls with the bsnl users. there is no charges and billing of this sim yet because it provides free service to the customer. the internet speed of jio is good.