(JIO) LTE to VOLTE Easy ।। अपने 4G LTE मोबाइल को VoLTE कैसे बनाएं

Disclaimer – This trick is working in Android Marshmallow custom roms (CM 13, Mokee, CRdroid, AICP). No guarantee that it will also work for all roms but you can try it at your own risk.

Go to settings
Go to sim1 settings
Go to APN
Create new APN
Name – ims
APN – ims
APN Type – ims
Save the APN

source

4g lte