Jio, now-a-days a very popular name in India. Mean only for VoLTE mobiles that provides free Internet and calling facility to any number as introductory Welcome offer. But as time spent, Jio launched its offer to all LTE enabled devices, who can access only Unlimited Internet but if they have to call, they should download JioJoin, now known as Jio4GVoice that turns the LTE device to VoLTE device.
But after some updatsles, Jio4GVoice is not working on first some hours of the day. It is a very important app for LTE device users.
So, it needs more bug fixes.