In todays generation there is 4g, 3g but phones are modified but they are 2g so the jio wi-fi will provides the 2g, 3g phones can use high speed volte means 4g in this generation all are buying 3 or more smart phones one for 2g, one for 3g and one for 4g this very difficult to use all this smartphones. so the jio wi-fi provides 4g for for 2g, 3g handsets there is no loss by using jio wi-fi