Hi,
I own LG G4 H818N(India). VOLTE option is disabled on Indian version hence in order to get VOLTE enabled, follow the steps mentioned below. I have tried and its WORKING !!
1) Download LG G4 Honk Kong version(This is version 5.1 and this is the one u need to install)
LINK :
https://yadi.sk/d/kW7fGfUQuHSAZ
2) Install the OS from the above given link using LGUP software.
a) Connect your mobile through data cable to PC while it is switched on and select UPGRADE and flash using the file downloaded from above link.
b) Dont worry, downgrading from marshmallow wont harm anything. I did the same thing.
3) After installation of HK version,
a)delete all previous APN and create these 2 APNs:
Name: Internet
APN: jionet
Type: default,ia
Protocol: IPv4 and IPv6
Name: IMS
APN: ims
Type: ims
Protocol: IPv4 and IPv6
b)Now, Go the to dialer and type - 277634#*#
c) go to FIELD TEST..then VOLTE On/Off...then SUBCRIBER..and then type all the settings shown in the 2nd comment of the post having 8 screenshots. The link of the thread is --> (
http://forum.xda-developers.com/g4/general/active-volte-lg-g4-dual-sim-t3471160) . Make sure everything is types exactly as shown in the screenshots. Once again I repeat, Follow the screenshots attached in the very starting (2nd comment )of the same thread and type exactly as shown in the screenshots. In short, make sure you leave nothing under SUBSCRIBER ,AoS and Debug Screen option.
4) RESTART your mobile.
5) Make sure VOLTE option is enabled in the notification panel. You can Also check the VOLTE status as shown in those 8 screenshots under the VOLTE DEBUG SCREEN setting which tells you VOLTE is ENABLED or DISABLED.
ENJOY !! you can now make VOLTE calls and Surf the internet over LTE simultaneously :laugh::laugh::laugh:
Thanks,
Arpit