Does anyone have WiFi calling working? - Xiaomi Mi 10T / 10T Pro Questions & Answers

I've tried the advice on this thread https://forum.xda-developers.com/xiaomi-mi-10-ultra/help/wifi-calling-t4157029/page2 and have managed to enable the settings for wireless calling, but when I have no mobile signal and am connected to WiFi the phone won't allow me to make calls, it says something like "unable to make call, please connect to a WiFi network"
Even though I'm connected to WiFi...
Has anyone else had any luck with this? I'm using a xiaomi Mi 10t, but I imagine it'd be the same for xiaomi Mi 10t pro.
Any help would be greatly appreciated

VoLTE and VoWiFi are working fine for me.
I bougt the phone from the same carried that I am using.

Thanks for the reply, yeah that's what I've found while I've been researching, it has to be carrier enabled for the phone. We can turn on the settings from the phone but if they haven't enabled it (usually in their branded firmware) it won't work...

kage00 said:
Thanks for the reply, yeah that's what I've found while I've been researching, it has to be carrier enabled for the phone. We can turn on the settings from the phone but if they haven't enabled it (usually in their branded firmware) it won't work...
Click to expand...
Click to collapse
Try
https://forum.xda-developers.com/poco-f1/how-to/guide-activate-vowifi-wlan-call-t3871263/amp/
https://xiaomi.eu/community/threads...-vowifi-on-t-mobile-austria.54182/post-525285
https://forum.xda-developers.com/showpost.php?p=80159761&postcount=83
I activated VoLTE and VoWiFi on my gf's Poco with the codes and the options show up but only VoLTE works.
I verified that it works, it stays on 4G while in call. When calling while on WIFI only it shows an VoLTE HD icon but VoWiFi is not working.
Don't feel to root her phone and try the other things.
Code:
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*

d3smond said:
Try
https://forum.xda-developers.com/poco-f1/how-to/guide-activate-vowifi-wlan-call-t3871263/amp/
https://xiaomi.eu/community/threads...-vowifi-on-t-mobile-austria.54182/post-525285
https://forum.xda-developers.com/showpost.php?p=80159761&postcount=83
I activated VoLTE and VoWiFi on my gf's Poco with the codes and the options show up but only VoLTE works.
I verified that it works, it stays on 4G while in call. When calling while on WIFI only it shows an VoLTE HD icon but VoWiFi is not working.
Don't feel to root her phone and try the other things.
Code:
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*
Click to expand...
Click to collapse
Thanks for this. I just spoke to my phone carrier yesterday and they told me that WiFi calling isn't supported from their end... So it looks like I'll be changing carrier, I need this to work

Related

How to enable VoLTE on Pixel?

Hi guys.
Let me elaborate my question.
1. I am totally aware that VoLTE on Android at the moment generally requires the handset to be from the carrier, or from the same region as the carrier for it to have the correct VoLTE (and VoWIFI) settings.
2. I am also totally aware that since Android 6.0, there actually has been a provision to allow carriers to send carrier settings to the user. I also know that this isnt being widely used.
After my ownership of my Pixel XL, I moved to a HTC U11, which I have flashed a custom ROM. This custom ROM managed to have the carrier settings for VoLTE for my carrier baked in.
I am keen on getting a Pixel XL2, so Im keen to see what the Pixel community is doing to enable VoLTE on networks that arent stocking the Pixel or Pixel XL.
Here in Australia, both generations of the pixel seem like they will be Telstra exclusives. and I am not inclined to go on their network!
Thanks for any assistance!
I use it with T-Mobile, only Verizon stocks it in the States. Volte works fine for me. Nothing i needed to do other than to setup the phone with the Sim card in the device.
Same here, got it with my T-Mobile SIM card.
This worked for me. Go to dialer and dial
*#*#4636#*#*
Phone Information
Turn on VoLTE
Turn on Video Calling
Turn on Wi-Fi Calling
Exit
I'm on Oreo 8.1 on my P2 XL, looks like it's already enabled. I'm on AT&T.
View attachment 4317129
Change carrier. AFAIK you'll never get enhanced LTE services using a non-AT&T branded phone on their network. Once I switched my pixel xl to T-Mobile things like that and wifi calling worked fine.
My condolences to your Pixel XL 2. I was in a Verizon store the other day just to check out PXL2. The blue tint when turning the phone horizontally - horrific. Also, barely faster than my Pixel XL, even if you care for that kind of thing (speed.)
CHANGiism said:
This worked for me. Go to dialer and dial
*#*#4636#*#*
Phone Information
Turn on VoLTE
Turn on Video Calling
Turn on Wi-Fi Calling
Exit
Click to expand...
Click to collapse
Same problem in Argentina, Pixel is NOT SOLD here so.... out of luck, but I tried this (already knew of the menu) and all my options are blacked out -can't enable any of them-, advice?????
Thanks.
If you can get root on your phone, flash magisk and there is a module in there to install that can enable VoLte and Wifi calling, worked for me on AT&T.
loeffler23 said:
If you can get root on your phone, flash magisk and there is a module in there to install that can enable VoLte and Wifi calling, worked for me on AT&T.
Click to expand...
Click to collapse
I need to try this when I get home. I get nowhere with ATT
LubbocksFall said:
I need to try this when I get home. I get nowhere with ATT
Click to expand...
Click to collapse
the module only changes the settings to allow for toggling but does not provide needed ims libraries.
CHANGiism said:
This worked for me. Go to dialer and dial
*#*#4636#*#*
Phone Information
Turn on VoLTE
Turn on Video Calling
Turn on Wi-Fi Calling
Exit
Click to expand...
Click to collapse
I had to toggle VoLTE off then on, restart. It's working for me now
"Turn on Video Calling"
Option is disabled, couldn't turn on
Depends if you're on Verizon or straight talk or what. I'm on straight talk and they don't offer VOLTE even though they use Verizon towers.
Using *#*#4636#*#*, the VoLTE provisioned option is greyd out. Anyone has a solution for this?
HSOC said:
Using *#*#4636#*#*, the VoLTE provisioned option is greyd out. Anyone has a solution for this?
Click to expand...
Click to collapse
It means your operator is not offering VoLTE, or, as in my case, Pixel XL is not approved by the operator. I have VoLTE on my SIM enabled and working with operator approved devices but network rejects Pixel as not compatible one.
ylapas said:
It means your operator is not offering VoLTE, or, as in my case, Pixel XL is not approved by the operator. I have VoLTE on my SIM enabled and working with operator approved devices but network rejects Pixel as not compatible one.
Click to expand...
Click to collapse
Operator offers VoLTE and it doesn't filter IMEI like in some cases. Other not approved devices (e.g xiaomi, oneplus) managed to enable volte via shortcuts. I am asking for a similar workaround. --thanks
Of you're on Straight Talk you're SOL. They don't offer it even if you're using a Verizon SIM
If you had geryed provisioning options you need to use magisks voenabler. a did it right now on december pie update. Now I have all enabled. Just waiting for operator to enable volte for my number. I wonder it will active.
Hi, my carrier does support VoLTE but the Pixel is not on its whitelist.
When dialing *#*#4636#*#* and going into phone info, the switches for "VoLTE Provisioned" is off and greyed out, but at the top of this screen I see "Voice Network Type: LTE". Does that mean I am getting VoLTE? I cannot see any other sign or symbol when calling. (I know some devices have a VoLTE symbol either in the status bar or during a call)

Wifi calling

So is it possible to enable wifi calling and/or VoLte on stock 8.1 rooted or any firmware of the pixel without being on Verizon? I am on AT&T so just wondering if there is a mod or something I can do to enable it.
Magisk has a module that can do that; VoEnabler .... this module will enable access to the features in the pixel, in Dialer, settings, etc. * but that doesn't mean you can actually use them;
First, check that your carrier/service actually supports the feature .... You can check with a secret code though; in Dialer;
*#*#4636#*#*
Then navigate to "Phone Information"... from there scroll down;
you should see the stuff for VOLTE, Wifi Calling, Video Calling, etc. If it's enabled then you may be good to go..
but if your carrier doesn't support it - enabling it via VoEnabler will do nothing to change that.
Also, I don't know about the US, but in Canada - some carriers (under some plans) do charge extra for this stuff.
loeffler23 said:
So is it possible to enable wifi calling and/or VoLte on stock 8.1 rooted or any firmware of the pixel without being on Verizon? I am on AT&T so just wondering if there is a mod or something I can do to enable it.
Click to expand...
Click to collapse
It is all carrier dependant, i got my XL from Verizon and I'm on TMO and wifi calling and volte is working but I don't think att supports the pixels for volte and wifi calling
fiffan86 said:
It is all carrier dependant, i got my XL from Verizon and I'm on TMO and wifi calling and volte is working but I don't think att supports the pixels for volte and wifi calling
Click to expand...
Click to collapse
Sort of this. Basically AT&T will not support VoLTE or WiFi calling on any unbranded unlocked devices brought onto their network. Never worked on my T-Mobile Note 4 nor my Google purchased Pixel XL. I was a long time subscriber to their service but once my dependency on MMS messaging increased I had no choice but to switch to another carrier. I wound up on Verizon after a brief time with T-Mobile. Both support full functionality of these devices.
nine7nine said:
Magisk has a module that can do that; VoEnabler .... this module will enable access to the features in the pixel, in Dialer, settings, etc. * but that doesn't mean you can actually use them;
First, check that your carrier/service actually supports the feature .... You can check with a secret code though; in Dialer;
*#*#4636#*#*
Then navigate to "Phone Information"... from there scroll down;
you should see the stuff for VOLTE, Wifi Calling, Video Calling, etc. If it's enabled then you may be good to go..
but if your carrier doesn't support it - enabling it via VoEnabler will do nothing to change that.
Also, I don't know about the US, but in Canada - some carriers (under some plans) do charge extra for this stuff.
Click to expand...
Click to collapse
Before installing magisk I dialed that number and they were all greyed out, I installed magisk installed the module and now VoLte and Wifi calling are both enabled in that menu and in the settings menu. I tested wifi calling and it worked. So maybe just need the module installed and it will work. That's what worked for me.
loeffler23 said:
Before installing magisk I dialed that number and they were all greyed out, I installed magisk installed the module and now VoLte and Wifi calling are both enabled in that menu and in the settings menu. I tested wifi calling and it worked. So maybe just need the module installed and it will work. That's what worked for me.
Click to expand...
Click to collapse
Cool. glad to hear my advice helped... but also using the secret code in the Dialer would've verified if your carrier supports it on their network, beforehand; that's why I posted in that step...
also, just as a reminder; I'd make sure that there aren't any hidden fees associated with using those features, I don't know much about US carriers; aside from that they are (generally) against Net Neutrality.... But I know with my particular carrier, in Canada; If i wasn't using the plan that I am on; they would be charging me extra - and it would add up quick... so best to double check, maybe.
nine7nine said:
Cool. glad to hear my advice helped... but also using the secret code in the Dialer would've verified if your carrier supports it on their network, beforehand; that's why I posted in that step...
also, just as a reminder; I'd make sure that there aren't any hidden fees associated with using those features, I don't know much about US carriers; aside from that they are (generally) against Net Neutrality.... But I know with my particular carrier, in Canada; If i wasn't using the plan that I am on; they would be charging me extra - and it would add up quick... so best to double check, maybe.
Click to expand...
Click to collapse
I came to this phone from a s7 edge that had VoLTe and Wifi calling on it never got charged for anything, would it be different with a non carrier phone?
loeffler23 said:
I came to this phone from a s7 edge that had VoLTe and Wifi calling on it never got charged for anything, would it be different with a non carrier phone?
Click to expand...
Click to collapse
I have no idea: I live in Canada and have never dealt with US carriers ~ that's something that you will need to verify on your own. Some may allow it; some may not... you guys do things quite a bit different south of the border, so I just don't know....
You should be able to find that out in the support/QA area of your Carrier's website ~ if not there, you can ask them directly.
but yeah, obviously, if it was working on your S7 - then your network supports it....
Hello, I am on Vodafone UK, recently my area is getting poor 4G coverage so the vodafone tech guy asked me to shift on wifi calling inside the house. He enabled it from carrier perpective but I have to enable it on handset as well. I struggled to find the option. Now using the secret code above I can see I have wifi calling option greyed out. btw, I am on stock android 8.1. What is the best and least intrusive way to get the wifi calling working on my handset.
I am not a developer but have experience with root on previous devices. If I have to install Magisk( is there a non-root option?) what module etc I need to install to get this working please..
praveenjohri said:
Hello, I am on Vodafone UK, recently my area is getting poor 4G coverage so the vodafone tech guy asked me to shift on wifi calling inside the house. He enabled it from carrier perpective but I have to enable it on handset as well. I struggled to find the option. Now using the secret code above I can see I have wifi calling option greyed out. btw, I am on stock android 8.1. What is the best and least intrusive way to get the wifi calling working on my handset.
I am not a developer but have experience with root on previous devices. If I have to install Magisk( is there a non-root option?) what module etc I need to install to get this working please..
Click to expand...
Click to collapse
Flash magisk and get the module called VoEnabler just sear h VoLte in the search bar it should pop up then after it installs restart phone and you should have the options.
Hi Praveenjohri - did you get this to work?
I too have a Pixel XL and on Vodafone UK; again the wifi calling option is greyed out.
Any layman guides as to how to Flash magisk and go about enabling this? Thanks in advance

Mi A2 Lite WiFi Calling?

Ok so I'm very disappointed that the WiFi Calling function (VoWifi) has been disabled in this phone, along with Volte, take a look in your phone information by dialing *#*#4636#*#* and you will see that they're both there but disabled. You can enable Volte by dialing *#*#86583#*#* and you will see an enhanced 4g LTE Mode option appear in network settings and get HD (calling) in the status bar when on 4g, depending on your network.
BUT, there seems no way to enable WiFi calling? There is a Magisk module available called voenabler which I have installed, it has enabled the wifi calling menu, but when I make a call with no mobile network I get the message "Mobile network not available. Connect to a wireless network to make a call" as opposed to the usual "Mobile network no available" So it seems that it's trying, but not seeing my network?
I know it can provider dependant, I get HD calling and IMS registration, just seems like an odd error msg, can anyone shed any light on this please?
From my research it seems that this could be an AndroidOne license thing, my Brother has bought a P20 lite and it works out of the box, are Google saving the functions for it's flagship Pixels or network contract phones? Wouldn't surprise me, maybe Pie will switch it on....... Doubt it.
I'm surprised that there is not more activity on this thread.
WiFi calling is very convenient in poor signal areas but as you say it seems to be disabled on this phone.
I'm now using A2 lite as my daily phone, VOLTE working great but lack of WiFi calling a real disappointment.
Just for mental support, I'm also very disappointed that this feature is missing. I really need this feature in my well isolated home. I have to go outdoors to make phone calls.....
Under debug (*#*#INFO#*#*) it's indeed still locked. Disabled carrier check for VOLte as you said with *#*#86583#*#* though.
Yes I've all but given up... I've had the phone months but not used it.
I'll keep it until the pie update, a comment on the pie thread said that it enabled volte with a working ims, I asked but no one confirmed wether or not vowifi was enabled or switchable in the info settings.
Trouble is there is no information about vowifi in any other android one phone? If I knew it was available I'd buy a Nokia 6.1 plus for example.
Reset phone back to factory, installed Pie ota, both volte and vowifi are disabled as in Oreo. Real shame as this A2 is a cracking phone for the price, but I'll have to find something else. Preferably AndroidOne with WiFi calling!
VoLTE & WiFI Calling not working for T-Mobile USA. Even 2G/3G calling is spotty at best. If you want to use the Mi A2 Lite for calling on T-Mobile in USA, good luck. 4G LTE, data, MMS/SMS are flawless, however calling is really bad.
Wifi calling is working fine, if you're supported the toggles show up in google phone.
I used magisk module voenable although I don't think it did anything, could be wrong but wifi calling and volte working great
Thanks Boe!
I see you're in the Uk, what network are you on? Contract / sim only? I've tried most in my A2 Lite and none worked but they were just payg sims. I haven't tried the voenabler again after installing Pie.
Both networks are contract ,Vodafone uk and EE UK, they both have wifi 4g calling enabled in there provider account , plus didn't work untill I dialed that number , flashed magisk also with module voenable. I didn't check for wifi option in Google phone before magisk so don't know if it helped or not. Reading in xiomi forum, it's disabled for certain countries including UK even though it's a global use phone, which is rediculous.Have a look in your provider account if you have one, or create an account so you have access to sim provider config.
Latest beta v27 Google phone if that helps.
Cheers. I'm on BT uk and have vowifi enabled as I've put my sim in an iphone and it went on wifi calling. My brother has ee, I'll try his card.
They seem to have done something new for Pie as previously only one sim could get 4g? Looks like I'll have to re-install magisk and try voenable again, was it simple in pie with the different bootimage?
Iforgetthings said:
Cheers. I'm on BT uk and have vowifi enabled as I've put my sim in an iphone and it went on wifi calling. My brother has ee, I'll try his card.
They seem to have done something new for Pie as previously only one sim could get 4g? Looks like I'll have to re-install magisk and try voenable again, was it simple in pie with the different bootimage?
Click to expand...
Click to collapse
Same process but with 10.20 patched boot in pie dump thread, i still made my own though, seems logical to use your own patched boot. Although check to make sure its the right size as first time i did it, the patch had zero bytes. Wifi calling enables on both sims and hd calling, i assume its just a bug, sometimes it works as expected and sometimes it enables everything on both sims lol, battery goes quick. Wish i could get nfc on it but theres no chip so thats a no go. As long as you dont mess with the system partition outside of magisk ota's will be more simple to sort out, keep stock boot as back up on pc and phone. Busy box is one file in sbin folder if you install it.
boe323 said:
I used magisk module voenable although I don't think it did anything, could be wrong but wifi calling and volte working great
Click to expand...
Click to collapse
I can confirm that Wifi Calling works on Orange Poland after installing VoEnabler module in Magisk:
Cheers Guys!
Reinstalled Magisk and Voenabler after removing it to upgrade to Pie, and have Wifi calling on BT uk! Tested and working.
Definitely something to do with Pie as would not work in Oreo (or without voenable in Pie)
Glad you sorted it bro, it's nice to have functions working.
Yes it is, you're right it is ridiculous that it's disabled and I still suspect it's androidone licensing or network pressure limiting the functions.
And it shows what a load of BS and miss-information there is around wifi calling, I called BT and asked saying I wanted to buy a new phone with it, the first guy who seemed quite bright said it should work if the phone's not on their official list as long as the phone supports it (he seemed a little reluctant, like he shouldn't be telling me) The second call when I asked if they could check I was sim enabled I was told by a lady that it definitely would not work unless I bought a phone from their list - Xiaomi? Who are they?
And according to my BT app I still don't have either volte or vowifi.....
I'm well pleased, I have no / borderline network signal from any provider in or around my home so now I have a working phone!
Guys any idea if the Pie update on A2 made possible the Vowifi? I tried on mine but only Volte seems to work. Cosmote Greece.
pados100 said:
Guys any idea if the Pie update on A2 made possible the Vowifi? I tried on mine but only Volte seems to work. Cosmote Greece.
Click to expand...
Click to collapse
Yes it works on pie but you need magisk and voenable module
I ve done all of them but nothing for me... Do you find the wifi calling option in your settings?

Cricket WiFi calling, on One Plus 5T

Has anyone figured out how to get WiFi calling working on Cricket wireless on the One Plus 5T. I have it enable, but doesn't seem to be working. I'm sure there has been a work around for this ?? Sometimes cell service in the house is spotty and this would really help missing calls. Any suggestions or work around, please advise.
have you tried installing voenabler module through magisk. That is if your rooted of course Iff it still wont work then your provider may not support it yet.
sam00561 said:
have you tried installing voenabler module through magisk. That is if your rooted of course Iff it still wont work then your provider may not support it yet.
Click to expand...
Click to collapse
I'm not rooted. They do support it, but on their own devices not BYOD, but I read there was a work around, so figured I's ask here.
I myself experienced the exact same situation a few years ago the provider I was with had the same policy and after many arguments with there call centre I decided to switch provider to where they didn't restrict the phones functions. Usually in such a situation you need there own bloated firmware to recieve volte/wifi calling. There isn't much of a way out of this in my opinion unless you change provider but I could be wrong. I think they do this so customers buy phones from them exclusively and it's a sly marketing thing. Sorry I couldn't help. It is possible however that by rooting and then installing the module I suggested you could get round this but there's no guarantee. That's if your prepared to root.
Maybe you've tried this already but I found the following.
https://www.onetechstop.net/2018/12...wifi-calling-on-a-oneplus-6t-on-atts-network/
sam0056 said:
Maybe you've tried this already but I found the following.
https://www.onetechstop.net/2018/12...wifi-calling-on-a-oneplus-6t-on-atts-network/
Click to expand...
Click to collapse
Yes I had already done this and enable it, but it still didn't work, I have it enabled but does not show up on the status bar. I'll keep researching, thanks though.
I had enabled from this link which is pretty much the same way, ( https://shkspr.mobi/blog/2018/08/enabling-voice-over-wifi-on-the-oneplus-5t-and-three-uk/ )
Good luck. Last resort might be changing provider. That's what I had to do.
sam0056 said:
Good luck. Last resort might be changing provider. That's what I had to do.
Click to expand...
Click to collapse
Thanks. It's not a big deal, missing calls doesn't happen often, would simply of been nice to be able to have the WiFi calling when able. No Biggie.
I read somewhere about flashing VoEnabler module via magisk ??, does this require root, or can it be flashed without rooting ??
Activate wifi calling in OnePlus 5T
Wifi have in a valid internet plan because wifi calling is use data for calling.
All steps to Activate wifi calling in oneplus are:-
Connect your OnePlus phone to any WiFi network.
Go to your one plus phone dialer and dial *#800# it automatically opens a new Log-test window and clicks on enter.
Find onplus Logkit and click it. It opens a new page.
Find Function Switch and click on it then new page open.
Find VoWifi switch checkbox and check it.
Then it shows an alert box to make the device reboot and reboot your oneplus device.
After rebooting device Go to settings > Wi-Fi & networks > SIM network Then find wifi calling toggle make enable it and enjoy wifi calling to make & receive calls.
To read all details on this topic then go Activate wifi calling in oneplus
Sunder, I've done the below before a while back, and it still doesn't work, I have Cricket wireless, so maybe that is why. I have enabled all, but in the status bar the icon for WiFi calling is not showing when WiFi calling is turned on, so I assume it's not connected.
sunder rawat said:
Wifi have in a valid internet plan because wifi calling is use data for calling.
All steps to Activate wifi calling in oneplus are:-
Connect your OnePlus phone to any WiFi network.
Go to your one plus phone dialer and dial *#800# it automatically opens a new Log-test window and clicks on enter.
Find onplus Logkit and click it. It opens a new page.
Find Function Switch and click on it then new page open.
Find VoWifi switch checkbox and check it.
Then it shows an alert box to make the device reboot and reboot your oneplus device.
After rebooting device Go to settings > Wi-Fi & networks > SIM network Then find wifi calling toggle make enable it and enjoy wifi calling to make & receive calls.
To read all details on this topic then go Activate wifi calling in oneplus
Click to expand...
Click to collapse
Which network service provider you are currently using means which sim is used in your phone.
Yes, I am very aware of that, and it doesn't work, I've tried it many times, Voltle or WiFi calling icon never comes on in status bar when enabled.
sunder rawat said:
Which network service provider you are currently using means which sim is used in your phone.
Click to expand...
Click to collapse
DJB628 said:
Yes, I am very aware of that, and it doesn't work, I've tried it many times, Voltle or WiFi calling icon never comes on in status bar when enabled.
Click to expand...
Click to collapse
Bro, I think wifi calling is not working in your region Because of the network service provider not staring wifi calling(VoWiFi) technology in your region.
And it may be oneplus 5T is not support your network wifi calling.
In my India, this technique is working and i am using it perfectly with jio and airtel.
That was my point a few post above, where I mentioned it does not work with Cricket wireless, and Cricket does offer VoWiFi, but it woks only with the phones you buy from them. So I was letting people know it doesn't work with Cricket.
sunder rawat said:
Bro, I think wifi calling is not working in your region Because of the network service provider
not staring wifi calling(VoWiFi) technology in your region.
And it may be oneplus 5T is not support your network wifi calling.
In my India, this technique is working and i am using it perfectly with jio and airtel.
Click to expand...
Click to collapse
DJB628 said:
That was my point a few post above, where I mentioned it does not work with Cricket wireless, and Cricket does offer VoWiFi, but it woks only with the phones you buy from them. So I was letting people know it doesn't work with Cricket.
Click to expand...
Click to collapse
Okk

VoLTE & VoWifi on Telstra in Australia

I managed to successfully change the carrier policies on my OnePlus to enable VoWifi and VoLTE in Australia using the guide here: https://forum.xda-developers.com/t/volte-vowifi-and-5g-in-aus.4284047/#post-85119383
My colleague has a Xiaomi Mi 10T Pro - is there a similar set of instructions available to enable VoWifi and VoLTE on that phone in Australia?
In NZ I had success using these Phone codes that turned on VoLTE for me (no VoWIFI for my network). These seem to be standard codes for Xiaomi worldwide that enable support if the underlying software recognises your network's version.
To turn on VoLTE: open your phone app and dial *#*#86583#*#* and you'll see a quick toast message saying it's turned on. Type the code again to turn it off.
To turn on VoWifi: open your phone app and dial *#*#869434#*#*
To check settings *#*#INFO#*#*
Also look under the SIM card settings. If you've enabled either properly there should be a menu item saying "Use VoLTE" and similar.
Once enabled for me it took a few minutes for VoLTE to register. I rebooted, but don't think that was necessary. Now I make VoLTE calls (4G stays in place during the call) and I have a VoLTE icon in the status bar.

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