Here is the technical explanation for the logic behind the free voice calls. Jio has an only 4G capability and no 3G or 2G. Most of the existing operators have all the 2G, 3G, and 4G. The existing operators transmit voice over 2G and 3G, whereas 4G is used only for Internet data. But on the other hand, Jio uses a technology called VoLTE where even the voice is transmitted as data packets over the 4G network.
Please note this is different from mobile data which is only for mobile internet – technically this transmission of voice through 4G is called Packet switching. Means packet switching is different from Mobile data which is only for mobile internet . This is the reason why even if one switches off mobile data in a Jio connection, calls are placed.
If your phone is not VoLTE enabled you will be able to make Calls only if you download the Jio app.
While the Jio technology is superior and latest, a Jio user ends up using huge additional data for every voice call user makes.
Thus in Jio one uses data for voice and the Internet. So when you use Jio for voice, you will be still using data. The starter plan may not benefit most of the users. We need to go for Rs. 499/- plan. Are you paying Rs.499/- or more to your current service provider? If yes, then only I recommend you to switch to Jio. If you are using more Voice, then please don’t go behind Jio’s promise of free Voice calls. There is * hidden cost included. If you have data balance then only you will be able to make voice calls.
Soon be prepared to consume high amounts of data on Jio and this is precisely Jio’s catch and that is why Jio charges for only data.