# VoLTE and VoWIFI in Australia

#### StelardActek

##### Senior Member
I'm pretty sure neither VoLTE nor VoWIFI will work in Australia for this device out of the box, particularly for Telstra. Can anyone who bought one confirm?

Is there likely to be a way to get them to work with modifications?

I am quite interested in this phone, but sadly given the reception where I live, lack of VoWIFI support would be a dealbreaker.

#### peddy2k

##### Member
You can enable VOLTE and VoWIFI with OnePlus Log Kit app.
Search with google: how-to-enable-volte-and-vowifi-on-oneplus-7-pro > theandroidsoul

StelardActek

#### chrisully

##### Senior Member
I'm pretty sure neither VoLTE nor VoWIFI will work in Australia for this device out of the box, particularly for Telstra. Can anyone who bought one confirm?

Is there likely to be a way to get them to work with modifications?

I am quite interested in this phone, but sadly given the reception where I live, lack of VoWIFI support would be a dealbreaker.

Sent from my [device_name] using XDA-Developers Legacy app

StelardActek

#### chrisully

##### Senior Member
Huh. That seems too simple. I had heard that Telstra in particular had a whitelist for which devices could access VoLTE on their network. Is that not the case?
No ideas mate. I'm in the UK but was not working for me out of the box. Followed that guide and working spot on now

Sent from my [device_name] using XDA-Developers Legacy app

#### StelardActek

##### Senior Member
No ideas mate. I'm in the UK but was not working for me out of the box. Followed that guide and working spot on now

Sent from my [device_name] using XDA-Developers Legacy app

Hm. Well I might see if I can find anyone in Aus that's bought one before I rush to shell out that amount of money. Thanks for the input tho!

#### happiboi

##### Senior Member
FWIW - i'll be trying as soon as mine arrives and gets setup.

unit should arrive today :fingerscrossed: , then charge, setup, and i'll try this VoLTE (and yes i'm on Telstra too).

What'll be interesting is whether 5G just works as is or whether I have to request it to be added/enabled on my Telstra plan?

#### happiboi

##### Senior Member
@StelardActek - sooo followed the guide that's in above link. Fairly straight forward and then gives you the 2 toggle switches in your sim card settings... Can toggle both VoLTE & VoWiFi BUT icons don't change, so I don't actually know if it's working or just a toggle for the sake of having a toggle.

#### StelardActek

##### Senior Member
@StelardActek - sooo followed the guide that's in above link. Fairly straight forward and then gives you the 2 toggle switches in your sim card settings... Can toggle both VoLTE & VoWiFi BUT icons don't change, so I don't actually know if it's working or just a toggle for the sake of having a toggle.

When you say icons, do you mean the status icons? Or do you mean the HD icon doesn't come up when making a call? AFAIK that's the only way to know if you're actually on VoLTE. Also VoWIFI will cut your call over to wifi a few seconds after connecting, if you're on wifi.

#### nathlynn22

##### Senior Member
@StelardActek - sooo followed the guide that's in above link. Fairly straight forward and then gives you the 2 toggle switches in your sim card settings... Can toggle both VoLTE & VoWiFi BUT icons don't change, so I don't actually know if it's working or just a toggle for the sake of having a toggle.
Turn airplane mode on. Then turn wifi on and see if you can still make calls in airplane mode through wifi.

#### happiboi

##### Senior Member
When you say icons, do you mean the status icons? Or do you mean the HD icon doesn't come up when making a call? AFAIK that's the only way to know if you're actually on VoLTE. Also VoWIFI will cut your call over to wifi a few seconds after connecting, if you're on wifi.

Yea I mean the status icon - I thought there was a 4G & VoLTE icon but I'm probably wrong.

A few quick tests -
• Made call Wifi On - Dialer has HD icon on screen
• Status bar icon stays the same - no indication of 4G/3G/H+ etc. , just the triangle bars
• Minimised dialler - launched browser, did speedtest - get 94.12Mbps........
• Hang up, status bar icon stays the same - no indication of 4G/3G/H+ etc. , just the triangle bars
• Made call Wifi Off - Dialer has HD icon on screen
• Status bar icon goes from 4G+ before dialling, to 3G during dialling, to H+ when call is connected..
• Minimised dialler - launched browser, did speedtest - get 4.21Mbps........
• Hang up, goes status bar icon goes from H+ back to 4G+

Not entirely sure what that all means now..

---------- Post added at 03:40 PM ---------- Previous post was at 03:36 PM ----------

Turn airplane mode on. Then turn wifi on and see if you can still make calls in airplane mode through wifi.

Just tried that - in the dialer app, a prompt comes up - "To Place a call, first turn off flight mode"

#### nathlynn22

##### Senior Member
Does it not say vowifi on status bar when wifi is on or Volte when wifi is off and data is on?

#### StelardActek

##### Senior Member
@nathlynn22 @happiboi AFAIK, if it says HD during a call you're on VoLTE. And if you're connect to wifi with VoWIFI enabled then a few seconds into a call it should swap over to using that instead of the LTE network. I forget what it says exactly but it does say something in text on the call screen that makes it explicit that it's using wifi for the call.

#### happiboi

##### Senior Member
Does it not say vowifi on status bar when wifi is on or Volte when wifi is off and data is on?

no vowifi/volte in status bar at all durign my tests

#### StelardActek

##### Senior Member
no vowifi/volte in status bar at all durign my tests

I know my current Pixel 2 XL does VoLTE and VoWIFI, and it also shows no icons in the status bar for either of these things. Just the HD icon on the dialer during calls, and the message on the dialer when routing voice via WIFI.

##### Senior Member

---------- Post added at 01:55 PM ---------- Previous post was at 01:52 PM ----------

no vowifi/volte in status bar at all durign my tests

Are you using Telstra? I'm on Telstra and have installed the Lockit and followed all the steps. I don't see HD on the dialer screen, do you mind sharing screenshot?

#### happiboi

##### Senior Member

---------- Post added at 01:55 PM ---------- Previous post was at 01:52 PM ----------

Are you using Telstra? I'm on Telstra and have installed the Lockit and followed all the steps. I don't see HD on the dialer screen, do you mind sharing screenshot?

Yea on Telstra - here is screenshot attached. (HD in red circle)

#### Attachments

• Screenshot_2020-05-08_at_18.52.23.jpeg
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#### happiboi

##### Senior Member
I know my current Pixel 2 XL does VoLTE and VoWIFI, and it also shows no icons in the status bar for either of these things. Just the HD icon on the dialer during calls, and the message on the dialer when routing voice via WIFI.

Hmmm then i definitely don't see any messages about wifi or wifi-call on the dialer during the call

##### Senior Member
Yea on Telstra - here is screenshot attached. (HD in red circle)
Cheers mate! Even now I'm getting the HD on dialler screen but no VOLTE & VoWiFI on the status bar.
My call quality has been exceptionally good and very crisp and clear.
I spoke with Telstra network team this arvo and they said OnePlus 8 is on their whitelist and is VOLTE compatible even they helped me diagnose the settings.

#### Enchiridion20

##### Member
Hi! Im much interested with oneplus 8 pro too, from AU as well. Any recommended seller? Thank you!

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• 10
Here's the screenshot & writeup of what I did:

Here is some screenshots of 5G reception, VoLTE icon, VoWiFi icon & VoWiFi Calling while in aeroplane mode to confirm all these things are working!
https://imgur.com/a/tau5wyX

So what did I do? All credits go to this guy on XDA to get VoLTE & VoWiFi working: https://forum.xda-developers.com/rog-phone-2/how-to/guide-enabling-volte-vowifi-v2-t4028073

For the TL;DR version, I did what I mentioned previously to get 5G going here:

Then to get VoLTE & VoWiFi working download these files:
EFS zip - https://drive.google.com/open?id=1PiVhB35MPx19sxqxQ4svgOvPXL1dxobt
MBNs zip - https://drive.google.com/open?id=1v8V281EkYGI_C1KeMqVni8L2qjQLdx5P
EfsTools 0.10 modded 1.2 - https://github.com/HomerSp/EfsTools...modded-1.2/EfsTools-0.10-modded-1.2-win32.zip
EfsTools 0.10 modded 1.1 - https://github.com/HomerSp/EfsTools...modded-1.1/EfsTools-0.10-modded-1.1-win32.zip

The reason I've linked both modded 1.1 & 1.2 is because 1.2 is the latest version and supports activation of 2nd SIM slot (but it errors for me so I used the modded 1.1 version but that only does SIM slot 1).

So steps:
- Enable the VoLTE/VoWiFi toggles first:
-Install the OnePlus Log Kit APK
- Open dialer, type in *#800# (If this doesn't do anything, just google search "Oneplus engineer mode apk", download and install it. Then retry)
- Click 'Enter' on the warning
- Select 'oneplus Logkit'
- Scroll down & select 'Function Switch'
- tick the VoLTE & VoWiFi switch options
- Then reboot.
- when your phone comes back after restart, in Settings > Wifi & network > SIM & network > SIM1 (and SIM2) > you should now see the 'Enhanced communications' area have the option to toggle on VoLTE/VoWiFi

Onto the actual making VoLTE/VoWiFi work:
- Unzip EfsTools into a directory
- Open command window on PC & navigate to the directory created in above step
- On your phone, go to dialer, type in *#801# - enter into it via 'engineer mode'
- Select "Rndis, diag switch" - ON (last time we selected "full port switch on")
- Then in the command window, you should be able to test connection to EFStools by typing "EfsTools.exe efsInfo"
- This should give some info & not any errors (mine was like 2 lines of information)
- Then the real fun begins.
- Extract the efs.zip from above download into the same directory as the EFStools (make sure the mcfg_autoselect_by_uim file is there - yes it's 0 bytes) and then run 2 commands:
- EfsTools.exe writeFile -i mcfg_autoselect_by_uim -o /nv/item_files/mcfg/mcfg_autoselect_by_uim
- EfsTools.exe writeFile -i mcfg_autoselect_by_uim -o /nv/item_files/mcfg/mcfg_autoselect_by_uim -s 1 (this one I couldn't get working - it's for SIM slot 2 & only works if usinf modded 1.2 version)
- should see 0 errors
- then open the MBNs zip & look for your carrier file. Ours are \aunz\<your carrier - e.g. mine is Telstra>\commerci\mcfg_sw.mbn
- copy this mbn file to the same dir as the EFStools, then run 2 commands:
- EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -v
- EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -s 1 (again this one I couldn't get working - it's for SIM slot 2 & only works if usinf modded 1.2 version)
- If it worked your screen should spew out a load of output but no errors.
- Reboot your phone & if you already enabled the switches from my above mentioned post, you should see the VoLTE/VoWiFi icons like in the screenshots linked above.

Seems like a lot but that's literally step by step explanation & takes roughly 5-10 mins to do slowly.

Happy days - 5G, VoLTE & VoWiFi all working on our OnePlus 8 Pro =)
7
Well this is awesome! Thanks for everyone's research - I now have 5G + VoLTE + VoWiFi all working on my OnePlus 8 Pro (IN2020 model) on Android 11 (OOS 11.0.2.2) on the Telstra network.

For some weird reason though, the "Telefonica_UK_Commercial" profile via PDC wouldn't give me 5G. Upon further investigation, I found that this profile + the carrier_policy.xml - didn't have the right config for my IN2020 phone.

Subsequently modified the carrier_policy.xml file further and BOOM! 5G is back. Researching the carrier_policy XML further - instead of specific band enabling per the previous config - I edit it to be 'hardware' so that whatever the hardware supports, it will be made available.

Anyhoo, long story short it's all working again thanks to you wonderful people

Summary of steps taken:

Code:
Prerequisites:
* Need ADB suite available on PC & enabled "ADB debugging" on phone via developer options
* When you permit your PC adb access to the phone after first adb command, make sure you tick always permit this device. When the phone boots after "adb reboot ftm", the screen is inactive so you can't authorize the device when you try to adb shell and are stuck
* Need QPST suite of apps installed on PC (needed PDC tools + EFS explorer)
* If on custom firmware - probably a good idea to backup your phone before you do this. On custom firmware after the first "adb reboot ftm" rebooting again puts the device in a boot loop until you format data
* You'll also need to ensure the toggles are enabled for VoLTE/VoWiFi before heading down this path too:
- Enable the VoLTE/VoWiFi toggles first:
- Install the OnePlus Log Kit APK
- Open dialer, type in *#800# (If this doesn't do anything, just google search "Oneplus engineer mode apk",                      download and install it. Then retry)
- Click 'Enter' on the warning
- Select 'oneplus Logkit'
- Scroll down & select 'Function Switch'
- tick the VoLTE & VoWiFi switch options
- Then reboot.
- when your phone comes back after restart, in Settings > Wifi & network > SIM & network > SIM1 (and SIM2) >                 you should now see the 'Enhanced communications' area have the option to toggle on VoLTE/VoWiFi

Then continue onto the main process:
- Open command prompt on PC & navigate to where your ADB suite is located

- Type command without "":
"adb devices" (I like to do this to ensure adb can speak with phone/computer)

- Should display:
List of devices attached
<if working, your device should be listed here (else, it'll be blank)>

- Type command without "":
--> This puts phone into field test mode

- Type command without "":
--> Creates dialogue for shell command on phone

- In the shell (OnePlus8Pro:/ $) type command without "": "setprop sys.usb.config diag,diag_mdm,qdss,qdss_mdm,serial_cdev,dpl,rmnet,adb" --> This opens up ports that we used to be able to in Android 10 - Phone Screen is still blank - but it's OK. - Start up PDC Tool in Admin mode on PC - Click drop down, select phone connection (there's only 1 in the list) --> ** If the drop-down box is empty and no phone/device listed, you cannot proceed. --> ** Other users have foudn this to be related to a Qualcomm driver issue. --> ** Delete the drivers you have currently installed and get a new one from here: --> ** https://gsmusbdriver.com/install-qualcomm-usb-driver. --> ** Also once the device shows up in PDC don't click on it, open efs explorer and let it start searching directories --> ** before going back to PDC and clicking on the device in the drop down. --> ** The window may say 'not responding' just leave it until the carrier list populates then carry on with below steps - Do the profile activation stuff for Telefonica_UK_Commercial: - Look for "Telefonica_UK_Commercial", right click and SetSelectedConfig for both Sub0 and Sub1 - Click on the above profile again and click on Activate - Do not restart your phone - Don't close PDC yet (don't know if it make a difference but I didn't close) - Open EFS Explorer (I opened in Admin mode too) - Navigate to "\nv\item_files\ims\" - Replace ims_user_agent file with one supplied --> The supplied one has Telstra VoLTE Qualcomm as header instead of Telefonica - Navigate to "\policyman" - Replace carrier_policy.xml & carrier_policy.xml_Subscription01 with ones supplied. --> Just take carrier_policy.xml and make a copy named "carrier_policy.xml_Subscription01" --> ** Caveat, I further modified the carrier_policy.xml file as it wasn't enabling 5G for me on my IN2020 (Android 11) Oneplus 8 Pro. --> ** I changed the nr5g_sa_bands base & nr5g_nsa_bands base values to be "hardware" rather than specifically band n78. --> ** This changes config to allow whatever 5G bands the hardware has available rather than specific bands --> ** You can't enable bands that the hardware doesn't support anyway so makes sense to enable all --> ** This gave me the needed 5G access with Telstra - Type command without "": "adb reboot" After phone boots back up, 5G + VoLTE + VoWiFi are all intact and in working order! Again, thank you to everyone's research and efforts to get this all working! @Mattycee have you given this a go yet ? 3 Well this is awesome! Thanks for everyone's research - I now have 5G + VoLTE + VoWiFi all working on my OnePlus 8 Pro (IN2020 model) on Android 11 (OOS 11.0.2.2) on the Telstra network. For some weird reason though, the "Telefonica_UK_Commercial" profile via PDC wouldn't give me 5G. Upon further investigation, I found that this profile + the carrier_policy.xml - didn't have the right config for my IN2020 phone. Subsequently modified the carrier_policy.xml file further and BOOM! 5G is back. Researching the carrier_policy XML further - instead of specific band enabling per the previous config - I edit it to be 'hardware' so that whatever the hardware supports, it will be made available. Anyhoo, long story short it's all working again thanks to you wonderful people Summary of steps taken: Code: Prerequisites: * Need ADB suite available on PC & enabled "ADB debugging" on phone via developer options * Need QPST suite of apps installed on PC (needed PDC tools + EFS explorer) Process: - Open command prompt on PC & navigate to where your ADB suite is located - Type command without "": "adb devices" (I like to do this to ensure adb can speak with phone/computer) - Should display: List of devices attached <if working, your device should be listed here (else, it'll be blank)> - Type command without "": "adb reboot ftm" --> This puts phone into field test mode - Type command without "": "adb shell" --> Creates dialogue for shell command on phone - In the shell (OnePlus8Pro:/$ ) type command without "":
--> This opens up ports that we used to be able to in Android 10

- Phone Screen is still blank - but it's OK.

- Start up PDC Tool in Admin mode on PC

- Click drop down, select phone connection (there's only 1 in the list)

- Do the profile activation stuff for Telefonica_UK_Commercial:
- Look for "Telefonica_UK_Commercial", right click and SetSelectedConfig for both Sub0 and Sub1
- Click on the above profile again and click on Activate
- Do not restart your phone

- Don't close PDC yet (don't know if it make a difference but I didn't close)

- Open EFS Explorer (I opened in Admin mode too)

- Navigate to "\nv\item_files\ims\"
- Replace ims_user_agent file with one supplied
--> The supplied one has Telstra VoLTE Qualcomm as header instead of Telefonica

- Navigate to "\policyman"
- Replace carrier_policy.xml & carrier_policy.xml_Subscription01 with ones supplied.
--> ** Caveat, I further modified the carrier_policy.xml file as it wasn't enabling 5G for me on my IN2020 (Android 11) Oneplus 8 Pro.
--> ** I changed the nr5g_sa_bands base & nr5g_nsa_bands base values to be "hardware" rather than specifically band n78.
--> ** This changes config to allow whatever 5G bands the hardware has available rather than specific bands
--> ** You can't enable bands that the hardware doesn't support anyway so makes sense to enable all
--> ** This gave me the needed 5G access with Telstra

- Type command without "":

After phone boots back up, 5G + VoLTE + VoWiFi are all intact and in working order!

Again, thank you to everyone's research and efforts to get this all working!

@Mattycee have you given this a go yet ?

Well this is awesome! Thanks for everyone's research - I now have 5G + VoLTE + VoWiFi all working on my OnePlus 8 Pro (IN2020 model) on Android 11 (OOS 11.0.2.2) on the Telstra network.

For some weird reason though, the "Telefonica_UK_Commercial" profile via PDC wouldn't give me 5G. Upon further investigation, I found that this profile + the carrier_policy.xml - didn't have the right config for my IN2020 phone.

Subsequently modified the carrier_policy.xml file further and BOOM! 5G is back. Researching the carrier_policy XML further - instead of specific band enabling per the previous config - I edit it to be 'hardware' so that whatever the hardware supports, it will be made available.

Anyhoo, long story short it's all working again thanks to you wonderful people

Summary of steps taken:

Code:
Prerequisites:
* Need ADB suite available on PC & enabled "ADB debugging" on phone via developer options
* Need QPST suite of apps installed on PC (needed PDC tools + EFS explorer)

Process:
- Open command prompt on PC & navigate to where your ADB suite is located

- Type command without "":
"adb devices" (I like to do this to ensure adb can speak with phone/computer)

- Should display:
List of devices attached
<if working, your device should be listed here (else, it'll be blank)>

- Type command without "":
--> This puts phone into field test mode

- Type command without "":
--> Creates dialogue for shell command on phone

- In the shell (OnePlus8Pro:/ $) type command without "": "setprop sys.usb.config diag,diag_mdm,qdss,qdss_mdm,serial_cdev,dpl,rmnet,adb" --> This opens up ports that we used to be able to in Android 10 - Phone Screen is still blank - but it's OK. - Start up PDC Tool in Admin mode on PC - Click drop down, select phone connection (there's only 1 in the list) - Do the profile activation stuff for Telefonica_UK_Commercial: - Look for "Telefonica_UK_Commercial", right click and SetSelectedConfig for both Sub0 and Sub1 - Click on the above profile again and click on Activate - Do not restart your phone - Don't close PDC yet (don't know if it make a difference but I didn't close) - Open EFS Explorer (I opened in Admin mode too) - Navigate to "\nv\item_files\ims\" - Replace ims_user_agent file with one supplied --> The supplied one has Telstra VoLTE Qualcomm as header instead of Telefonica - Navigate to "\policyman" - Replace carrier_policy.xml & carrier_policy.xml_Subscription01 with ones supplied. --> ** Caveat, I further modified the carrier_policy.xml file as it wasn't enabling 5G for me on my IN2020 (Android 11) Oneplus 8 Pro. --> ** I changed the nr5g_sa_bands base & nr5g_nsa_bands base values to be "hardware" rather than specifically band n78. --> ** This changes config to allow whatever 5G bands the hardware has available rather than specific bands --> ** You can't enable bands that the hardware doesn't support anyway so makes sense to enable all --> ** This gave me the needed 5G access with Telstra - Type command without "": "adb reboot" After phone boots back up, 5G + VoLTE + VoWiFi are all intact and in working order! Again, thank you to everyone's research and efforts to get this all working! @Mattycee have you given this a go yet ? For some weird reason though, the "Telefonica_UK_Commercial" profile via PDC wouldn't give me 5G. Upon further investigation, I found that this profile + the carrier_policy.xml - didn't have the right config for my IN2020 phone. Subsequently modified the carrier_policy.xml file further and BOOM! 5G is back. Researching the carrier_policy XML further - instead of specific band enabling per the previous config - I edit it to be 'hardware' so that whatever the hardware supports, it will be made available. Anyhoo, long story short it's all working again thanks to you wonderful people Summary of steps taken: Code: Prerequisites: * Need ADB suite available on PC & enabled "ADB debugging" on phone via developer options * Need QPST suite of apps installed on PC (needed PDC tools + EFS explorer) Process: - Open command prompt on PC & navigate to where your ADB suite is located - Type command without "": "adb devices" (I like to do this to ensure adb can speak with phone/computer) - Should display: List of devices attached <if working, your device should be listed here (else, it'll be blank)> - Type command without "": "adb reboot ftm" --> This puts phone into field test mode - Type command without "": "adb shell" --> Creates dialogue for shell command on phone - In the shell (OnePlus8Pro:/$ ) type command without "":
--> This opens up ports that we used to be able to in Android 10

- Phone Screen is still blank - but it's OK.

- Start up PDC Tool in Admin mode on PC

- Click drop down, select phone connection (there's only 1 in the list)

- Do the profile activation stuff for Telefonica_UK_Commercial:
- Look for "Telefonica_UK_Commercial", right click and SetSelectedConfig for both Sub0 and Sub1
- Click on the above profile again and click on Activate
- Do not restart your phone

- Don't close PDC yet (don't know if it make a difference but I didn't close)

- Open EFS Explorer (I opened in Admin mode too)

- Navigate to "\nv\item_files\ims\"
- Replace ims_user_agent file with one supplied
--> The supplied one has Telstra VoLTE Qualcomm as header instead of Telefonica

- Navigate to "\policyman"
- Replace carrier_policy.xml & carrier_policy.xml_Subscription01 with ones supplied.
--> ** Caveat, I further modified the carrier_policy.xml file as it wasn't enabling 5G for me on my IN2020 (Android 11) Oneplus 8 Pro.
--> ** I changed the nr5g_sa_bands base & nr5g_nsa_bands base values to be "hardware" rather than specifically band n78.
--> ** This changes config to allow whatever 5G bands the hardware has available rather than specific bands
--> ** You can't enable bands that the hardware doesn't support anyway so makes sense to enable all
--> ** This gave me the needed 5G access with Telstra

- Type command without "":

After phone boots back up, 5G + VoLTE + VoWiFi are all intact and in working order!

Mate, you're a freaking legend. (Magisk Canary root: IN2020 / Android 11 / 11.0.2.2.IN11AA / BOOST network)

I got abit confused with the "carrier_policy.xml_Subscription01" part as it wasn't in any of the files you provided, so just assumed I had to just copy and rename the "carrier_policy.xml".

Also EFS explorer took a little longer than I expected to start up (~1 minute) just incase anyone thinks theirs crashes and close it prematurely.

Worked like a charm.

Cheers
3
Nah, I actually used the 'ims_user_agent' File linked above by Jaansberger.

The only thing I used from Happyboi's original exploit, was the Engineering APK File to enable 5G. However, make sure you don't install the Engineering APK before you do the initial VoLTE/VoWi-FI Process listed above by Mike_Fre.

So basically order of steps I followed:

- Mike_Fre's steps to enable the 'Telefonica VoLTE Qualcomm' Profile.
- Jannsberger's step to insall the 'ims_user_agent' file (Before doing the adb reboot step listed in Mike_Fre's Post).
- Watched and replicated the YouTube video (Which I linked in my post above), to enable 5G and still have VoLTE/VoWi-Fi.

Hope this clears things up for you, but if you have any further questions, I'd be happy to try and help.
That worked perfectly!!! Thankyou!!!
3
We have a working solution without root that is easier than previous instructions.

You still need the old toolkit app and #*800# to activate vowan and volte functions if you haven't done in the past.

Follow:

In essence...