[LG G7 ThinQ  Guides, News, & Discussion] stuclark:
Following on from some excellent work done in the V30 forum by seadersen; I have had FULL success in enabling VoLTE and VoWiFi for UK and other European networks.

You will need the EU G710EM variant phone with unlocked bootloader and root access in orfer to enable this, but it is then possible to re-lock the phone to enjoy all protected Android / Google services, such as Android Pay.

You will also need a working ADB installation on your PC.

Prerequisites:

Firstly, lets download some needed files:

Download the patched v10f bootloader from here: https://drive.google.com/file/d/1WB-...ew?usp=sharing.

Download MagiskManager from here:https://******************/#How_toDownload_Magisk_Manager_Latest_Version_591_For_Android_2018_Method_1

Download the unmodified (original) v10f boot.img from here: https://drive.google.com/open?id=1nG...S2Zy0xU70_o_pK

Instructions

1) Unlock your bootloader. There are instructions on how to do this on LG's Developer website here: http://developer.lge.com/resource/mobile/RetrieveBootloader.dev?categoryId=CTULRS0702 .When you have your unlock.bin file, reboot into fastboot mode and apply the unlock.bin using the commands below:

adb reboot bootloader
fastboot flash unlock unlock.bin
fastboot reboot

Your phone will do a factory reset at this stage - only bother doing the minimum required initial setup, as this won't be the last factory reset of the day...

2) Get root access to your phone. There are number of ways of doing this, but the easiest is to flash a modified boot.img file to your unlocked boot loader; then install Magisk. Enter the following commands:

adb reboot bootloader
fastboot flash boot_a patched.img
fastboot flash boot_b patched.img
fastboot reboot

3) Install a root file browser & editor. I use Solid Explorer for this.

4) Install Magisk - I sideload this from my PC to the downloads folder on the phone, then install it from there using Solid Explorer. Allow it to update *TWICE* - do not do the third update as this seems to crash Magisk constantly.

5) Open Solid Exploer and navigate to the following location in your root storage: Root > OEM > OP > OPEN_EU > CONFIG folder and open the VO_CONFIG.XML file

6) You now need to add settings for your network in the file above... You'll need to know your network's MNC & MNC for this, which can be found from the LG hidden menu *#546368#*710# under the Field Test > SIM Info section. You can add just the network you use, or all for your country, or any other combination of your choosing.

You need to edit the file in two places... Under the section add some or all of the following (these are UK network entries, change as you require) - one set per network, edit to suit your personal network

<info mcc="234" mnc="10"><!-- O2U -->
<prop
support_volte="1"
support_vt="1"
/>
</info>

<info mcc="234" mnc="15"><!-- VOD -->
<prop
support_volte="1"
support_vt="1"
/>
</info>

<info mcc="234" mnc="20"><!-- H3G -->
<prop
support_volte="1"
support_vt="1"
/>
</info>

<info mcc="234" mnc="30"><!-- EEO -->
<prop
support_volte="1"
support_vt="1"
/>
</info>

... Under the section add some or all of the following: (these are UK network entries, change as you require) - one set per network, edit to suit your personal network

<info mcc="234" mnc="10"><!-- O2U --> <prop
epdg_enable="1"
/>
</info>

<info mcc="234" mnc="15"><!-- VOD -->
<prop
epdg_enable="1"
/>

</info>

<info mcc="234" mnc="20"><!-- H3G -->
<prop
epdg_enable="1"
/>
</info>

<info mcc="234" mnc="30"><!-- EEO -->
<prop
epdg_enable="1"
/>
</info>

7) Save the file and reboot your phone ... VoLTE and VoWiFi should now be working, but to enable all GUI elements, launch the LG hidden menu by typing *#546368#*710# into the dialer, then go to Field Test > GPRI VoLTE/VoWiFi > UX menu and ticking all the options.

8) You now have a phone with working VoLTE and VoWiFi. You can stop at this point if you want, or you can continue to re-lock your phone to re-enable DRM and Android protected services

9) Now we need to flash the unmodified 10f boot.img to our phone before re-locking the bootloader. Enter these commands:

adb reboot bootloader
fastboot flash boot_a 10f.img
fastboot flash boot_b 10f.img
fastboot reboot

10) Lock your bootloader. You'll need to re-enter fastboot to do this:

adb reboot bootloader
fastboot oem lock
fastboot reboot

Your phone will now do a factory reset (again), but when you've gone back through the setup VoLTE and VoWiFi should still be enabled. Complete the experience by turning on all the UX options in the LG hidden menu again (see step 7)