Jio is the fastest growing mobile operator in India. It is providing free mobile data and calling. Earlier it was till 31 December 2016, now this offer is extended till 31 March 2017. Earlier the data limit was 4GB, none it is being reduced to 1GB. it has good internet speed but its network coverage is comparatively low to other networks. It has HD voice calling which provides rich voice calling. But its biggest disadvantage is that it requires VoLte for calling. Mobiles which are not VoLte cannot call by Jio. But there have provided an app called Jio4gVoice to call though mobile data.