After a long time new update come for Honor mobile, EMUI 4.1 is a great update with voLTE ( Voice Over LTE) support.
VoLTE for RIL Jio 4g . this is a big update, just 493 update is this.
How to update: HONOR HOLLY 3- EMUI 4.1.3
This update is OTA ( Over the Air ), so you know need to update it manually by download package file or like this. Just go to Setting >> update option and check for update.
Be sure your mobile have at least 50% charged, and I recommend you to connect with wifi and than update your phone.
After successful update you able to call through VoLTE directly. you have no need to install JIO4Gvoice app.
FOR ANY SUGGESTION PLEASE COMMENT.