yashsingh1/xdaforums huggingface dataset:
[OnePlus 5 Guides, News, & Discussion] serenityx888:
I have a OP5T with A10 and I want to enable Volte and Wowifi with EfsTool but when I write this command "EfsTools.exe writeFile -i mcfg_autoselect_by_uim -o / nv / item_files / mcfg / mcfg_autoselect_by_uim" I get this message: Critical error. Operation not permitted!

What could be the problem?
[OnePlus 5 Guides, News, & Discussion] jkim204:
I'm more curious as to how you were able to gain root on LOS20..
[OnePlus 5 Guides, News, & Discussion] lockmunk:
i revert to OOS just to enable this thing. after that i flash back aosp and volte works.

in custom i dont know how to enable full port on usb.

---------- Post added at 11:36 AM ---------- Previous post was at 11:26 AM ----------

works VoWIFI & VoLTE on telco Digi from Malaysia

Thanks !
[OnePlus 5 Guides, News, & Discussion] baadnewz:
Tried on OnePlus 6 running OOS 5.1.9 with Orange Romania Simcard. using Telefonica UK you get the logos in statusbar but you can not place or receive calls.

Then I used Telia Finland Option instead of Telefonica and now it works
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
can you try to qpst with "run as admin" (mouse right click)
[OnePlus 5 Guides, News, & Discussion] astracd:
I have same error .. tried on two laptops... everything installed as administrator... and run as admin... but getting same error as you.
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
Can be broken drivers of device?
[OnePlus 5 Guides, News, & Discussion] astracd:
I was getting two devices on the list. One was my network card. If you disable it then you can access the phone without error.

Simple as that.
[OnePlus 5 Guides, News, & Discussion] chibi:
Tried with orange belgium, nothing to do, dont work, i tried all options
[OnePlus 5 Guides, News, & Discussion] ulxerker:
Great stuff, thanks for that!

Working fine here, O2 Germany.
[OnePlus 5 Guides, News, & Discussion] astracd:
Not working with Freedom Mobile in Canada.

I tried all of them
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
How did you managed it?

I'm very stuck at Activate and Start.

Nothing happens, or an error is displayed.

---------- Post added at 11:48 AM ---------- Previous post was at 10:48 AM ----------

Is it supposed to appear some message after click activate or start? Because I click and nothing happens!
[OnePlus 5 Guides, News, & Discussion] ulxerker:
No, the activate button is just greyed out after clicking it. After that reboot your phone and it should work.
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
When i press activate, nothing happens... Neither the button turns grey :(
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
As you see... it's all ok, but when i press activate, nothing happens, and sometimes i get error
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
Any ideas?
[OnePlus 5 Guides, News, & Discussion] astracd:
nothing happens... if you press 3 times in the row... you will get error...

Best way to check is when you restart your phone... connect again from step 4)

4) open dialer app and enter *#801#

Set Serial and Full-port switch to ON

5) Open "Software Download" in your QPST start menu folder,

And check if it remember your last activated SUB0 and SUB1.

if it did not remember - you probably did not remove " right click on "Oversea-Commercial_DS" and deactivate Sub0 and Sub1

Click on Oversea-Commercial_DS again and click on remove"

This one should not be on the list, if you do not remove it it will go back to it each time you restart the phone.

If it did remember and doesn't work... then deactivate sub0 and sub1, and activate on next one. Until you find one that works...
[OnePlus 5 Guides, News, & Discussion] RogerF81:
Works perfectly, thanks for the guide!
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
Suddenly it started working.

Yes, I've removed those lines...

And no, it's not needed to press neither activate or start. When you select some sub, it'll automatically activate it. At least for me .

UK wasn't working, for me, Vodafone Portugal, India worked.

I now have VoLTE. FINALLY!

THANKS EVERYONE.
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
Just one question. I'm on OOS betas. When I'll update the phone software, will this be keeped? Forever?

Thanks.
[OnePlus 5 Guides, News, & Discussion] ulxerker:
Yes, it survives flashing of system, firmware and modem.
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
Hi, i am using qpst 2.7.453. i can not find "mfcg" tab option on "software download". Can you share photo of this option. Thanks
[OnePlus 5 Guides, News, & Discussion] ulxerker:
Just download newest version here: https://jamal2367.com/VoLTE-VoWiFi/QPST_2.7.460.zip, its much easier.

After install you'll have an application called PDC, start that one and select your phone on the top, then proceed with "Right-click on "Oversea-Commercial_DS" and select "Sub0" and "Sub1" under "Deactivate"." and so on.
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
thanks a lot.
[OnePlus 5 Guides, News, & Discussion] jamal2367:
Update Links on Post 1 :)
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
thanks Jamal. your tutorial worked volte and wowifi in Turkey's operators (Türkcell and Vodafone TR)
[OnePlus 5 Guides, News, & Discussion] goalando:
Working for Mexico , carrier: Telcel.

Ty so much
[OnePlus 5 Guides, News, & Discussion] shadowstep:
[MENTION=3068641]jamal2367[/MENTION] I assume this tutorial is for OOS only and not people using custom ROMs, correct?
[OnePlus 5 Guides, News, & Discussion] SpartaKurd:
At first I time tried I had volte toggle next to the network. But after first reboot I lost it, and I tried many times again, but I couldn't have it again. I'm using Vodafone/Turkey. How can I have volte back again?
[OnePlus 5 Guides, News, & Discussion] astracd:
Connect again and check if it return back to stock, or you still have active whatever you pick to be active when it work first time.
[OnePlus 5 Guides, News, & Discussion] SpartaKurd:
I connected again, many times, it's just like what I activated. But no volte
[OnePlus 5 Guides, News, & Discussion] chibi:
Hello,

I called my network operator and volte wasnt activated on my simcard! After that, a reboot and it works! (Orange BELGIUM)

Volte and Vowifi ok!
[OnePlus 5 Guides, News, & Discussion] elbuenzurdo:
Did you do just the procedure of the post and it started working, or did you have to go to a Telcel Center to get VoLTE enabled?
[OnePlus 5 Guides, News, & Discussion] SpartaKurd:
Is there any way to revert it back? In my opinion OP should add it to the topic, either.
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
you can use this tutorial in custom roms. but a little different from oos. if you open diag port your devices, you can do it. I tried miui rom and worked. but carrriers different than oneplus.
[OnePlus 5 Guides, News, & Discussion] ulxerker:
As you did a backup of your original EFS partition before, just restore it in TWRP and its back to normal.
[OnePlus 5 Guides, News, & Discussion] SpartaKurd:
I'm not rooted, I just did adb backup -all, will it revert it back?
[OnePlus 5 Guides, News, & Discussion] seiya174:
Merci fonctionne parfaitement sur Bouygues France
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
hi jamal, thanks for tutorial. i want to activate volte/vowifi on xiaomi mi5 device. i am login it with pdc. but carrier list different than oneplus. can i add new carriers to list? regards
[OnePlus 5 Guides, News, & Discussion] goalando:
Volte was already activated, but not working with oneplus until now.
[OnePlus 5 Guides, News, & Discussion] Marteicos:
I just activated VoLTE with Tim Brazil carrier on Rio de Janeiro. Thanks.

Used this one

Volte_OEM_Lab
[OnePlus 5 Guides, News, & Discussion] smokada:
I have my OnePlus 5T working in Vodafone Portugal, but with VoLTE activated conference call didn't work

If I turn off VoLTE using the settings menu works nice
[OnePlus 5 Guides, News, & Discussion] jerrygo2:
I have problem to launch com.oneplus.factorymode.specialtest app via oneplus stock dialer by *#801#.

What should I check or do for resolving this problem?

I cannot go further for applying VoLTE profile change.

OP5 is on xXx Nolimit 3.1 but I think it's based on stock OOS or OOS beta.

I applied several magisk moules like busybox for ndk, HEVC for video recording, call recording enabler, pixel 2 wifi, viper4androidfx, qualcomm wifi bonding.

By any chance, is there something that can be affected to this issue?

Any idea will be welcome.

Thanks in advance.
[OnePlus 5 Guides, News, & Discussion] gtoussai55:
Je suis chez SFR France avec un OnePlus 6. J'ai bien le Volte en ayant activé Volte-oem-lab. Mais pas de VoWiFi. Tu as activé lequel toi pour avoir Volte et VoWiFi fonctionnels ?
[OnePlus 5 Guides, News, & Discussion] angourakis:
Merci ! Thank you!

I was trying to enable VoLTE on my OnePlus 5 in Brazil and none of the original profiles worked. However, VoLTE-OEM-Lab worked flawlessly!

I'm now trying to enable WiFi-Calling. If I succeed, I'll let you know =)

EDIT: only one carrier has VoWiFi here. I guess, no lucky for me (but I'm super happy to have VoLTE enabled)
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
J'essaye ce soir si tel est le cas, merci du retour ! ?
[OnePlus 5 Guides, News, & Discussion] pcm2008:
Thanks!

VoLTE and VoWiFi are fully functional on MTS Russia with Telefonica_UK_Commercial profile.

Correction: ViLTE/ViWiFi do not work on Telefonica_UK_Commercial because IMS video functionality is disabled in the profile. With India_VoLTE_Vodafone everything works perfectly.
[OnePlus 5 Guides, News, & Discussion] Baptiste94:
Did you managed to get it working because I didn't :crying:

OP5T // OOS 5.1.4 // Magisk // Bouygues Telecom
[OnePlus 5 Guides, News, & Discussion] SpartaKurd:
Still I couldn't make it work :( I'm using Vodafone turkey, volte activated for the sim card by operator.
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
I have try with Telefonica_UK_Commercial and India-VoLTE-Vodafone but don't work..

Edit : India-VoLTE-Vodafone work in France (Bouygues Telecom) after call to service center of my operator for enable VoLTE (The service is not activated automatically).
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
Ok c'est bon pour moi, j'ai appelé Bouygues Telecom au 614 en leur demandant d'activer la VoLTE sur ma ligne et c'est ok, j'ai reçu un SMS de confirmation et 30secondes plus tard le logo VoLTE.
[OnePlus 5 Guides, News, & Discussion] Uselessjunk:
Disable the Oneplus Analytics module in Magisk
[OnePlus 5 Guides, News, & Discussion] Baptiste94:
Merci beaucoup ! J'ai appelé le 614 et pareil ils me l'ont activé, j'avais essayé une première fois par chat textuel et ils m'avaient répondu que toutes les lignes Bouygues ont le VoLTE d'activé par défaut... Du coup ça marche parfaitement merci beaucoup de ton retour :). J'ai utilisé Commercial-TMO parce qu'avec Vodafone India j'avais pas la 4G

[MENTION=3068641]jamal2367[/MENTION] Thanks a lot !! VoLTE working flawlessly unfortunately VoWifi doesn't work but that's all good for me.

Phone : OnePlus 5T

ROM : OOS 5.1.4

Root : Magisk V16 + VoEnabler1.2

Carrier : B&YOU by Bouygues Telecom

Profile selected in PDC : Commercial-TMO

VoLTE :good:

VoWifi :crying:
[OnePlus 5 Guides, News, & Discussion] elbuenzurdo:
I just couldn't do it. I went to Telcel and they told me that since I didn't buy the phone with them, they couldn't link my IMEI to the VoLTE service (and thus, they could not activate it). Did you have VoLTE with another device before and had it enabled with Telcel?
[OnePlus 5 Guides, News, & Discussion] goalando:
Yeah with a Samsung...

So you must bring a compatible telcel volte ready phone, like sg 7,8,lg g5se...or a cheap lanix ilium.
[OnePlus 5 Guides, News, & Discussion] thaidroid:
xXx just posted that you have to install this fix on Stock Rom and then Flash xXx afterward, Check this post https://xdaforums.com/showpost.php?p=77312162&postcount=15930
[OnePlus 5 Guides, News, & Discussion] thaidroid:
Tried both India and UK profile, both drops to H+ when I make a call so I guess it does not work,

True Thailand is my phone company.
[OnePlus 5 Guides, News, & Discussion] godzifa:
Does anyone tried with Salt in Switzerland?

My bootloader is locked and I don't really want to try this if it doesn't work as I don't want to wipe my phone...
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
this action not requiered an unlocked bootloader. you can follow instructions. i dit it aand operation succesfull.
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
did you try other options?
[OnePlus 5 Guides, News, & Discussion] godzifa:
Ok but you can't backup your EFS partition if you don't have TWRP as a custom recovery, right? And to have TWRP installed, you need your bootloader unlocked...

And as I have found on Internet, nandroid backup doesn't include EFS partition...
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
yes you're right. your choice...
[OnePlus 5 Guides, News, & Discussion] godzifa:
I'm trying to pull all mbn file from my OP5 by using adb but I don't where those files are located (I tried:

system/etc/customization/modem/

/system/etc/firmware/

/system/rfs/apq/gnss/readonly/firmware/image/modem_pr/mcfg/configs/mcfg_sw/generic/sea/ ) but with no luck.

Does anyone know where they are located ?
[OnePlus 5 Guides, News, & Discussion] godzifa:
Hello,

This is my config (VoWifi works (most important for me), VoLTE dosnn't work (I called my carrier but they don't know what I'm talking about...)) :

Country : Switzerland

Phone : OnePlus 5

ROM : OxygenOS 5.1.4

Root : none

Carrier : Salt

Profile selected: India-VoLTE-Vodafone
[OnePlus 5 Guides, News, & Discussion] ddrager:
This is good.
[OnePlus 5 Guides, News, & Discussion] thaidroid:
No
[OnePlus 5 Guides, News, & Discussion] Dimontiman:
Works great

Germany

Vodafone

Open beta 16

Please call Vodafone to activate vowifi and lte
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
Hello, I don't know why but today VoWifi (and also VoLTE) works well with Bouygues Telecom in France :
[OnePlus 5 Guides, News, & Discussion] HC4Life:
Any video showing the steps?
[OnePlus 5 Guides, News, & Discussion] michikrug:
Do you guys also notice a higher idle drain when VoWIFI/LTE is enabled? Especially noticed it over night when the usual loses only a few percentages of battery, it now does a lot more.
[OnePlus 5 Guides, News, & Discussion] JohnyRi:
I spoke with a person involved in some operator and I learned that VoLTE is often not enabled by default for all SIM cards.

When a VoLTE compatible phone is used for the first time, it tries to do a registration to HSS, but that is rejected.

At some point in the future (usually once per day), a log from HSS is taken, failed registrations are matched and those with incompatible phones (phones the operator knows are causing troubles) are removed.

This list of failed registrations is added to a provisioning queue to create new profiles in the HSS.

The queue has also some new users limit per day so it might take a few days to your SIM card be enabled.

I was advised to wait a week and try again, but I guess the second day might work too.
[OnePlus 5 Guides, News, & Discussion] godzifa:
So what do you suggest?

Remove and insert the SIM card once a week to see if the operator activates VoLTE ?
[OnePlus 5 Guides, News, & Discussion] Fik2207:
In my case, VoLTE works perfectly. OnePlus 5 - Operator O2 Czech Republic.
[OnePlus 5 Guides, News, & Discussion] elbuenzurdo:
I finally got Telcel to activate Volte to my SIM. However, it seems like the configuration I chose in the program does not work for Telcel. [MENTION=2793819]goalando[/MENTION] do you remember which settings you used?
[OnePlus 5 Guides, News, & Discussion] JohnyRi:
I guess just restarting phone should be OK. At this point, I have a special number available where I can test if my call is made using VoLTE or not.

They told me in case VoLTE doesn't work out of a box (now it does not) try to wait a few days.
[OnePlus 5 Guides, News, & Discussion] goalando:
Use india vodafone, dont forget to use magisk voenabler
[OnePlus 5 Guides, News, & Discussion] Stefan McSleaze:
I just tried to get VoLTE & VoWifi running and its done! It was less difficult as i expected before.

I'm with one Sim only, Provider is DRILLISCH (Germany) in the O2 network.

OOS 5.1.5

Thanks to the devs for the tutorial and keep on that good work???
[OnePlus 5 Guides, News, & Discussion] Blumdum:
Is there any way to make a backup of your efs partition without root?

or to be more precise backup the partition with a locked bootloader (no twrp)?
[OnePlus 5 Guides, News, & Discussion] jordirpz:
Hi, when I enter * # 801 # in the phone application, nothing happens.

oneplus5 OB15
[OnePlus 5 Guides, News, & Discussion] elbuenzurdo:
Have you used any debloater app? Or custom Rom/magisk module like XxX? They remove factory mode, which is what opens when you dial *#801#.
[OnePlus 5 Guides, News, & Discussion] godzifa:
Nope
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
Hello, is it possible to run the VoEnabler magisk module without magisk?
[OnePlus 5 Guides, News, & Discussion] steffanyouyi:
Wow, it works on u mobile malaysia carrier also, just activate volte_oem_lab instead of india/uk as mentioned in OP

**This is only tested with U Mobile network in malaysia
[OnePlus 5 Guides, News, & Discussion] michikrug:
This module is not necessary anymore, if you run stock OOS:

Just enable VoLTE/VoWIFI by dialing *#800# and toggling "oneplus Logkit" --> "Function Switch" --> "VoLTE switch und VoWifi switch"
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
Oh yes thank's ! ?
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
No
[OnePlus 5 Guides, News, & Discussion] Darkdragontc:
Am i going crazy or when i look at the guide i didn't see one for United States. Unless i'm missing something?
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
You missing something. It's a world-wide method. Just make sure your operator has activated the VoLTE for your line.
[OnePlus 5 Guides, News, & Discussion] 9988338275:
I am from India I have One plus 3T US version A3000. Oxygen is 5.0.6.

But problem with Volte is here with Jio Volte.

Even the volte is enabled in settings but not working.

So any solution is here ?
[OnePlus 5 Guides, News, & Discussion] Planet X:
I have enabled both VoWifi and VoLTE. Should I see a VOLTE icon on the statusbar now? I don't see the icon. It's enabled in the view settings for the statusbar.
[OnePlus 5 Guides, News, & Discussion] ngshixuan:
https://xdaforums.com/oneplus-5t/how-to/guide-volte-vowifi-german-carriers-t3817542
[OnePlus 5 Guides, News, & Discussion] Planet X:
So I still have to follow the guide then. Wil try hat when I'm home.

Edit: Yes!! It works. Thank you!
[OnePlus 5 Guides, News, & Discussion] psiLion:
I can't download the files as i got redirected to the main page at jamal2367.com is there any other source to download the files?
[OnePlus 5 Guides, News, & Discussion] acemimerakli:
you can find files on https://android-hubo.de/thread/8203-...eischalten-de/
[OnePlus 5 Guides, News, & Discussion] Minux31:
This guide worked great on french carrier Bouygues Telecom, thank you !
[OnePlus 5 Guides, News, & Discussion] Escribis:
So I have a major problem...Firstly I have a contract with the phone company of Cosmote at Greece...The main thread says that VoWifi and Volte in Cosmote is ok with this process and now begins the problem I did everything correct even the activate and start button, but when I restarted the phone neither the VoWifi sign nor Volte was enabled...

Does anyone has an idea the reason??
[OnePlus 5 Guides, News, & Discussion] venioni:
You must first activated your sim card and then try threat tutorial.

Στάλθηκε από το ONEPLUS A5000 μου χρησιμοποιώντας Tapatalk
[OnePlus 5 Guides, News, & Discussion] Escribis:
And how do I activate my sim card...

If I activate my sim card there is no reason to do the tutorial cause my mobile company will do it...

Also Cosmote Mobiles doesn't support OnePlus 5...
[OnePlus 5 Guides, News, & Discussion] venioni:
It doesn't matter if cosmote support OnePlus 5 , you must first activated your sim card number. For activated you sim card send message WIFICALL TO 1333 ( for activated with message method must have a compatible device) otherwise you must've call Cosmote support center to activated your number.View attachment 4648646View attachment 4648647View attachment 4648648

Στάλθηκε από το ONEPLUS A5000 μου χρησιμοποιώντας Tapatalk
[OnePlus 5 Guides, News, & Discussion] Escribis:
Yes you were right I contacted with the support of Cosmote and now everything is ok I have VoWiFi and VoLTE...

One more question if I make an update is this gonna change and should I do everything from the beginning or not?

---------- Post added at 09:34 PM ---------- Previous post was at 09:33 PM ----------

:victory::victory::victory:
[OnePlus 5 Guides, News, & Discussion] venioni:
Yes

Στάλθηκε από το ONEPLUS A5000 μου χρησιμοποιώντας Tapatalk
[OnePlus 5 Guides, News, & Discussion] Escribis:
Yes it gonna change and I must all the process from the beginning or yes everything will be as they were...
[OnePlus 5 Guides, News, & Discussion] Minux31:
1st answer ;)
[OnePlus 5 Guides, News, & Discussion] Minux31:
[MENTION=3068641]jamal2367[/MENTION] : Does the second method of your german thread on Hubo is functional for French carriers ? Thx
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
His method works with a lot of operator. In France, it works with Bouygues Telecom.
[OnePlus 5 Guides, News, & Discussion] Minux31:
Thank you for your response. I know the 1st method works in France, I tested it with my Op5 (Bouygues) and with a Op6 (Sosh), both have VoLTE now. My question is just to know if the second method for custom rom works with french carriers as the 1st method ;)

I want to switch to a custom rom that support it, but I have to apply the second method to have VoLTE on it.
[OnePlus 5 Guides, News, & Discussion] AlexCmb:
Oh sorry, I read too fast. Since I'm no longer at Bouygues Telecom, I can not tell you if the second method works .. Orange sucks with her VOLTE..
[OnePlus 5 Guides, News, & Discussion] eNVy:
How to enable VoLTE on OnePlus 5 running LineageOS 15.1 ?
[OnePlus 5 Guides, News, & Discussion] GilX:
Hello, anyone had luck with Canadian carriers... Rogers in particular? Thanks.
[OnePlus 5 Guides, News, & Discussion] Minux31:
Hi,

You have to follow german link in OP and use second method (I've tried it, but unfortunatly it didn't worked, only the first method works on Oos for me)
[OnePlus 5 Guides, News, & Discussion] Minux31:
Hi,

I've restored my original EFS, and applied method 2 on Oos. It worked on Oos after reboot, and after installing HavocOS, I've got VoLTE on HavocOs with french provider Bouygues Telecom, great guide, thank you !

So method 2 works only with original EFS, not after having VoLTE with first method.
[OnePlus 5 Guides, News, & Discussion] jamal2367:
Great !!
[OnePlus 5 Guides, News, & Discussion] tournet:
same question here, I can't connect the phone with PDC.
[OnePlus 5 Guides, News, & Discussion] Minux31:
Because you have to be on OxygenOS to use this guide ...
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
Well, after updating to Android Pie on Open Beta 22 on OnePlus 5, I lost VoLTE. It shows on menus, but when I place a call it switched to 3G.
[OnePlus 5 Guides, News, & Discussion] cruzzmz:
Same on 5T ... couldnt even enable it in the

*#800# --> oneplus Logkit --> Function Switch --- (No option for volte)
[OnePlus 5 Guides, News, & Discussion] mrasquinho:
Do the process again. It's working now!

Maybe you have to choose a different country (India, UK, etc...), But it's fully working.
[OnePlus 5 Guides, News, & Discussion] Dave_247:
I've upgraded to OOS Beta 22 Pie, installed Magisk and the VoLTE enable module and turned them on in the settings, but I'm not getting any icon that VoLTE is working. I was using other custom pie roms and had VoLTE working on them after having modified my EFS according to the guide.

EDIT: Repeating the steps has caused VoLTE to start working again.
[OnePlus 5 Guides, News, & Discussion] cristiancas:
OB23
[OnePlus 5 Guides, News, & Discussion] Axelguitt:
I can confirm : the VoLTE option is back in OB 23 Pie!