Reliance jio is aiming to offer such a network which does not ask the users to pay for voice calling any more.They achieved this by using voLTE method.The coverage goes all over India even in remote locations.As of now Jio is providing data and voice calling for free until March 31, 2017 under the Happy New Year Offer.After that it is expected to provide voice calling free of cost, but a minimum transaction of some amount has to be recharged every month in order to keep the sim alive.Jio is also trying to provide wifi at faster speeds and less costs by giving Jio Fibre Wifi to all over India.The customer service of jio is also good.