The jio is related to reliance which have launched by mukesh ambani this sim is of 4g.if any one want this sim you have get it in reliance digital showroom.for jio sim you have apply an addhar card, jio coupon code, and two photos take them and go to the showroom there u have to apply this then they will give sim for u it will activated in 1hour.after activating u have to call 1977 jio service center call say ur details then the net of jio will activate u can enjoy 4g net.firstly the net will be fast after some days it will become slow.it is good by taking jio sim u can enjoy free net, calls and message.if u want this fastly apply it will till upto december 31 after u cannot take the sim I think the days will extend.thank u all