VoLTE is working in preinstalled Cyanogen OS but not in CyanogenMod I was trying to use VoLTE in my phone but eventually landed up with result:


CyanogenOS can run VoLTE based SIM card
CyanogenMod can't run them.


Tried
1. Setting LTE Only option in ##4636##
2. Setting APN in Sim Settings
3. Also kept the VoLTE in SIM Slot 1

But nothing worked in CyanogenMod.

Does any one have idea how to use both VoLTE and CyanogenMOD both?
Currently my phone's CyanogenOS is allowing me to keep only one at a time :)

But I want to use cyanogenMod as it is marshmallow and nightly build updates are released.
You have to enable the internet option for the 4g sim, which you're using and restart the phone. This will only enable LTE not volte internet.