yashsingh1/xdaforums huggingface dataset:
[Xiaomi Mi 9 Guides, News, & Discussion] seemebreakthis:
I am sorry but how do you cancel a dialer code? I have already entered the code before to activate the WiFi calling option...

Thanks.
[Xiaomi Mi 9 Guides, News, & Discussion] RedWave31:
You enter it again ^^
[Xiaomi Mi 9 Guides, News, & Discussion] fossiltkm:
Does anyone know if there there is something in the buildprop line that prevents you from editing it? Every time I add the suggested lines and save and exit with RootExplorer, the buildprop reverts to it's original state. And I am rooted.

Just found out that my issue maybe Q related(Android 10). I am attempting this on the latest Xiaomi.eu ROM anyways.
[Xiaomi Mi 9 Guides, News, & Discussion] RedWave31:
There might be several things:

- File or partition is locked or read-only

- Insufficient priviledges

If you can't edit it on the spot, I suggest you copy the file on a computer, edit it, then paste it. You can then compare the timestamps. I found that this solution worked everytime, whereas Text Editors might fail sometimes.
[Xiaomi Mi 9 Guides, News, & Discussion] j7899:
Excellent work, and eager to try out...waiting on the lock hold to clear.

I read through the Mi forum as well, and those who can fix don't seem interested to do so. Is this something that Xiaomi.eu might or has addressed?
[Xiaomi Mi 9 Guides, News, & Discussion] fossiltkm:
And this is the sad part. I read through Mi forum as well, and they could care less. Whenever I flash a new MIUI ROM, this is my go to! Big respect to RedWave31 for putting this together for us. If it weren't for him, I would have had to resort to just using AOSP ROMS just to have volte support!
[Xiaomi Mi 9 Guides, News, & Discussion] g_seva:
I have entered the codes and options are active. Mi 9 global, xiaomi.eu 9.9.27.
[Xiaomi Mi 9 Guides, News, & Discussion] khalid1393:
Thank you, it's works with me
[Xiaomi Mi 9 Guides, News, & Discussion] Jehonan:
Let me first just say that this forum thread has some excellent information's and some clever and ingenious solution for given problems!

My gratitude and hands down to authors!

I personally didn't wish to make any kind of "drastic" solutions like unlock and rooting. Instead of this I have just additionally edited my APN's, installed google ims and activity manager with which I have selected my country modem config file and in google ims i have entered my international number and after entering dialer codes and VoLTE and VoWiFi options activation I can say that everything is working!

When i make call from home or from somewhere where my phone is connected on WiFi, phone uses WiFi and when I'm out of reach of some WiFi network, there is 4G+, VoLTE, VoWiFi, R and 3G sign (i have two SIM's from which SIM2 is in constant roaming mode). When I'm at home and phone is connected to my network in between signal strength signs is small WiFi sign with small telephone handset in the bottom (same signs is also when I'm calling someone and phone is connected on WiFi network).

For now, everything is working wonderfully!
[Xiaomi Mi 9 Guides, News, & Discussion] vitonline:
It worked for me without root for both VoLTE and VoWiFi like a charm.

Thanks
[Xiaomi Mi 9 Guides, News, & Discussion] rocalino:
How did you do that?
[Xiaomi Mi 9 Guides, News, & Discussion] Jehonan:
1. Go to Settings->SIM cards and mobile networks->choose appropriate primary SIM if You have two SIM's and edit APN's from this SIM (use guide from the beginning of this post to do this, just throw out "mms". MMS service has it's own separate APN)

2. Install com.google.android.ims.apk (download this apk from apkmirror).

3. Install com.activitymanager.apk

4. Run activitymanager app, find com.xiaomi.mbnloader and choose Your carrier.

5. Again in activirymanager app find com.qualcom.qti.ims.ImsSettings and enter Your SIM international number.

6. After this, best will be to reboot and after successful reboot enter dial codes from beginning of this guide to activate (in fact this disables checking from provider side) VoLTE and VoWiFi, after this best will be to again reboot your phone.

I hope that this answers will help You?!

P.S.

For God sake please use different color to emphasize Your question second time, this yellowish is horrible and unreadable!!!
[Xiaomi Mi 9 Guides, News, & Discussion] emilusi37:
pe Vodafone Romania mi9 nu are inca activat volte si vofi
[Xiaomi Mi 9 Guides, News, & Discussion] RedWave31:
Using the codes works most of the time, but in my experience, only once and for a single SIM Card. I changed my provider, and somehow the codes were locked on the previous SIM, so I had to fix it manually.

I have zero hopes about MIUI 11 and I believe I might have to do additional research on VOLTE for it to work properly.

I haven't worked on unlocking the native VVM, it's quite harder unfortunately since pretty hard locked, on the providers side this time.
[Xiaomi Mi 9 Guides, News, & Discussion] fossiltkm:
I've recently gone back to stock global ROM and relocked my bootloader. While just using the codes, using the activities manager app, and entering my international number to the ims settings work, I am in the same boat with you regarding vvm with T-Mobile. The fact that we have to do these modifications in the first place really has me thinking twice about buying another Xiaomi device...
[Xiaomi Mi 9 Guides, News, & Discussion] Jehonan:
Yes, I can understand your disappointment but it is what it is.

I personally really can't understand that "some" developer can't solve this issues once and for all because all this build.prop "mambo jumbo" and almost "backdoor modification" to make something work as it should be is really embarrassing and shameful for third or fourth world manufacturer like Xiaomi.
[Xiaomi Mi 9 Guides, News, & Discussion] hazelkitten218:
ATT???

Does anyone know if this works on AT&T MVNO networks, specifically Cricket, in the U.S.?

---------- Post added at 01:13 AM ---------- Previous post was at 01:03 AM ----------

Did you find out if it works? I'm on an AT&T MVNO, Cricket, & am wondering if it will work.
[Xiaomi Mi 9 Guides, News, & Discussion] Jehonan:
I believe that you will get only real answer if you try this by yourself!

There is so much variables in this "equation" and to be totally honest it's really hard, almost stupid and crocked, to tell somebody:"yes, sure, it's working 100%, and so on", when one really can not say exactly will it work or not!
[Xiaomi Mi 9 Guides, News, & Discussion] fossiltkm:
And as expected, with the Global MIUI11 update, this workaround is broken for me. On T-Mobile US by the way. I no longer have access to com.qualcom.qti.ims.ImsSettings...
[Xiaomi Mi 9 Guides, News, & Discussion] speedking999:
Just updated to MIUI11 EEA and volte still not working

It was working just fine on my older phones Galaxy S6 and Motorola G5s

There are no IMS APNs and when I try to add them manually they disappear

Come on Xiaomi it's 2019 why use 3G to make phone calls
[Xiaomi Mi 9 Guides, News, & Discussion] fossiltkm:
And the sad thing is, I will more than likely have to go the AOSP route just just to have working VOLTE....
[Xiaomi Mi 9 Guides, News, & Discussion] carnivalrejectq:
I just got a mi 9t and using this I successfully got WiFi calling and volte to work on Metro.......but for some reason mms isnt working on WiFi calling. Anyone know why?
[Xiaomi Mi 9 Guides, News, & Discussion] Edredd7:
Redmi Note 8 be help

I have service with Altice mobile and having problems with getting my Redmi Note 8 to work with the service it's says ATT when I first put in the SIM but then the signal is lost when I go to SIM settings it's says my phone number if someone could help I would appreciate it
[Xiaomi Mi 9 Guides, News, & Discussion] gerhard_wa:
You are posting in the wrong forum. Use the Mi 9T/Redmi K20 forum instead.

---------- Post added at 08:34 PM ---------- Previous post was at 08:30 PM ----------

You are posting in the wrong forum. Use the Redmi Note 8 forum.
[Xiaomi Mi 9 Guides, News, & Discussion] quadeur06:
After make the code and activate in settings (VOLLTE AND VOWIFI )

I called my operator (Sosh/Orange) in france and they activate to me all the options

But yesterday all disappear :(
[Xiaomi Mi 9 Guides, News, & Discussion] j7899:
Anyone having VoLTE issues where the other party cannot hear but you can hear them? I see mention in this thread of the opposite. Toggling speaker phone on and off fixes the issue, but quite annoying to do so. Additionally calls via bluetooth do not exhibit the issue so it appears to be solely on the handset itself.
[Xiaomi Mi 9 Guides, News, & Discussion] Derek69:
Having the same, not always but often enough that it made i annoying so I turned off volte and are only using the wifi calling option.
[Xiaomi Mi 9 Guides, News, & Discussion] kaydentc1:
i made a guide on how to get volte working and wifi calling enabled. you should check it out sometime
[Xiaomi Mi 9 Guides, News, & Discussion] Derek69:
Yes i saw that guide, I had no problem enabling either volte or wifi-calling on my phone but unfortunately I had issues with how it worked. sometimes no sound, sometimes the phone would just hang-up instead of answering so in the end I decided to disable Volte, at least for now.
[Xiaomi Mi 9 Guides, News, & Discussion] kaydentc1:
It really be like dat sometimes. May I ask what carrier you have? The reason why I am asking this is because i was facing the same problem at one point.
[Xiaomi Mi 9 Guides, News, & Discussion] Derek69:
I'm i Sweden on tele2
[Xiaomi Mi 9 Guides, News, & Discussion] heynando:
you folks that want VolTE on Brazil using the carrier TIM, follow this tutorial here = https://c.mi.com/thread-2548272-1-0.html

basically you have to use the MBNLoader of Malaysia the rest will be automatic, it worked for me, I have VolTE ON
[Xiaomi Mi 9 Guides, News, & Discussion] berkens:
Tnx for the hint to DISABLE VoLTE and VoWiFi. Nobody expects that.

Only difference between my K20 Pro and my Samsung S8 is that the dialer in MIUI doesn't show the green dial button with a small wifi logo.

After the connection is made, there is a wifi logo.
[Xiaomi Mi 9 Guides, News, & Discussion] lordxenu:
so i have a weird issue on my Xiaomi

Wifi calling is only working in airplane mode with wifi turned on.

Turn off airplane mode and wifi calls wont work.

I think it's down to it preferring the mobile network over wifi but i have no option to tell it to prefer WiFi calls, anyone know how i can change that ?
[Xiaomi Mi 9 Guides, News, & Discussion] Derek69:
in settings/ sim cards and mobile networks/your sim card/ at the bottom there is a setting "Network preferences". That should be set to "Prefer Wi-Fi".
[Xiaomi Mi 9 Guides, News, & Discussion] lordxenu:
that's where it normally would be yeah at least it is on my other android phoens, but not for my xiaomi phone.

i do have a "preferred network type" menu in the SIM menu but it only says

>Prefer 4G

>Prefer 3G

>2G only (saves battery)
[Xiaomi Mi 9 Guides, News, & Discussion] Derek69:
Do you have the "Make calls using Wi-Fi" toggle at the bottom? Toggling that should hide and show the next settings below it.
[Xiaomi Mi 9 Guides, News, & Discussion] lordxenu:
no new menu appears after toggling it :/

[IMG="screenshot"]https://i.imgur.com/m52nKEO.jpg[/IMG]

phone is on MIUI Global 11.0.1 stable
[Xiaomi Mi 9 Guides, News, & Discussion] lightcao:
I have the same thing and issue. I remember they took out the option to select prefer wifi calling out in a later version of miui 10. Now that I upgraded to miui 11, there is no avoiding it. I tried looking in the hidden menus for a toggle enabler or something like that and found nothing. If someone could figure this out, that would be awesome! For now, if I want to rely on WiFi Calling, I just leave it on airplane mode though I would not.
[Xiaomi Mi 9 Guides, News, & Discussion] lordxenu:
small update, this might be set by the carrier (in which case you'd think it would be possible to override somehow).

today I have been testing UK mobile SIMs from different networks because I plan to swap to a network with better

signal ... anyway I noticed on two SIMs I don't get to chose the preferred network for WiFi calling .. but on EE sim I can.

When I tested the EE SIM and turned on VoWiFi the preference menu suddenly appeared and I was able to change it from

prefer mobile network to prefer wifi

[IMG="screenshot"]https://i.imgur.com/9LfgeuK.jpg[/IMG]

but on three and vodafone and giffgaff .. I cannot, this menu is just gone. Not greyed out. Gone.
[Xiaomi Mi 9 Guides, News, & Discussion] Scazwh26:
Finally

Finally have Wi-Fi calling on my MI 9, I bought my MI 9 in October for a respectable £419.00 (Ebuyer UK). I came from a Samsung Galaxy S9 Plus which had VoLTE and Wi-Fi calling but switching to the MI 9, I only had VoLTE. Not a massive problem but I live in North Wales and inside signal is not great on any network, especially at work, I have no signal at all but do have Wi-Fi so with Wi-Fi calling now working, I should receive those important text messages.

I inputed the two codes, switched off the phone, powered back on and went to the sim card settings. VoLTE there as normal, Make calls using WI-Fi and reading some of your posts, the network preference which I have set to Prefer Wi-Fi as I have Wi-Fi pretty much everywhere.

Thanks to the person or persons(s) that found this solution, I can confirm my phone works with VoLTE and Wi-Fi calling on BT Mobile (UK).
[Xiaomi Mi 9 Guides, News, & Discussion] cdl2:
Do you mean that, with Vodafone, wi-fi calling does not work at all?

Or that it works, but the phone chooses to switch to mobile signal if the wifi is not strong enough?

May I also ask where you bought the phone from? I have been considering a Mi Note 10 from clove.co.uk
[Xiaomi Mi 9 Guides, News, & Discussion] lordxenu:
On Vodafone, there is no option to chose to prefer WiFi or the mobile network. VoWiFi does work on voda, but yeah no choice to chose WiFi preferred. I bought my phone from tobydeals
[Xiaomi Mi 9 Guides, News, & Discussion] cdl2:
Sorry, I am a bit confused, what does that mean in practice?

Does it mean that, without that option, it's the phone which chooses if the wifi signal is strong enough to route calls via wifi-calling, and, if it isn't, it makes calls through the mobile network?

If so, why is that even relevant? Unless the phone can't properly identify which has a stronger signal between wifi and mobile network?

Thanks!

PS On a separate note, how have you found the phone in general? Not too slow for every day use? Does the battery last a good 20-30% more than on 4,000 mAh phones like the Samsung Galaxy, the p20/p30 pro etc?
[Xiaomi Mi 9 Guides, News, & Discussion] lordxenu:
in practice, it means on my phone if I want to do VoWiFi and that menu isn't there then the only way I can do it is to turn on airplane mode and then turn wifi on. If there is a mobile signal, the phone will not do VoWiFi and will prefer the mobile network instead.

On the separate note, I find my battery lasts all day, I can only compare it to my Samsung S10 and it seems to last a lot longer. The phone is plenty fast for what I need. I never understood who actually needs the specs of a flagship phone. I can run every app, there's no noticeable lag or delay, memory seems fine, games work just fine etc.
[Xiaomi Mi 9 Guides, News, & Discussion] aelfinn:
Just encountered a strange phenomenon: If I activate VoLTE, certain numbers cannot be called; the call terminates before even being connected. If I switch off VoLTE, that number connects normally. Most numbers seem to be okay, though, and both landlines and mobile phones. My previous phone (a Mi 9T) connected to that number via VoLTE without a problem. Can someone help troubleshoot this?
[Xiaomi Mi 9 Guides, News, & Discussion] marcel112:
I am on tmobile Netherlands and they don't support this on any Xiaomi .

anybody got an idea to get it working?

I am about to cancel my contract at t-mobile for this, bad reception
[Xiaomi Mi 9 Guides, News, & Discussion] Filip Witkowski:
I have some problem.

On my Mi9 Global Stock system VoLTE and VoWiFi works perfectly. After moving to Pixel Experience VoLTE still works, but VoWiFi not. Any idea? Can I move some files from stock ROM to actual? Change Vendor?

Orange PL
[Xiaomi Mi 9 Guides, News, & Discussion] sjhotwings:
did the codes and got Volte and Call Via Wlan enabled in Settings, also call Redpocket ( at&t mnvo ) to activate Wifi call and Volte activated on the account. Volte worked as i see the icon show on status bar, but Wifi calling is not working. any help ? p.s i'm running Miui stock stable rom 11.0.9
[Xiaomi Mi 9 Guides, News, & Discussion] maluminse:
Last week att phone reception is horrid. They suggest using wifi calling.

I find a thread or two.

https://gizarena.com/enable-wifi-calling-on-mi-a2/

https://xdaforums.com/Mi-9/how-to/wifi-calling-volte-mi-9-t3917887/page14

Followed the directions and the phone says its 'on'. But when I call I dont get the little emblem under the phone of wifi to indicate wifi calling.

Also the calls still take forever to go through and get horrible reception.

Any ideas on why wifi calling not working?

Wifi calling enabled

https://imgur.com/a/lXnRz8D

Default for phone not set. Relevant?

https://imgur.com/a/tu1qRy0

Any assistance much appreciated.
[Xiaomi Mi 9 Guides, News, & Discussion] lightcao:
My method still working great on MIUI 12. I'm on the Xiaomi.eu rom.
[Xiaomi Mi 9 Guides, News, & Discussion] :
Works with Three (3) UK on Mi 10 Ultra MIUI 12.0.13

VoLTE *#*#86583#*#*

VoWIFI *#*#869434#*#*

Thank you very much- this works for me! :good:

I'm using Xiaomi Mi 10 Ultra running MIUI 12:good:.0.13 stable verison with Chinese ROM

My carrier is Three (3) UK.

Many thanks once again!
[Xiaomi Mi 9 Guides, News, & Discussion] Danchibald:
And you did all that without root? I have Mi 10T Pro, tried to follow your steps, but I cannot find com.xiaomi.mbnloader and com.qualcom.qti.ims.ImsSettings?! Maybe because of MIUI 12?
[Xiaomi Mi 9 Guides, News, & Discussion] Jehonan:
Yep!

All without root access on MIUI 10!

But You have a right, let's just say that this "guide" is old and obsolete now.

Unfortunately new MIUI comes with new issues and obstacles but usually keeps errors and miss features from previous ROM iterations.

Beauty of Xiaomi's MIUI ecosystem.
[Xiaomi Mi 9 Guides, News, & Discussion] Danchibald:
Suddenly today... I didn't do anything [emoji23][emoji23][emoji23]
[Xiaomi Mi 9 Guides, News, & Discussion] Jehonan:
Yep!!! ????*♂️
[Xiaomi Mi 9 Guides, News, & Discussion] holymoz:
tried almost everything but never had volte on my mi 9 lite despite is compatible from carrier.

anyway cant try the modem config thing because on miui12 there is any modem config option, anyone can help?
[Xiaomi Mi 9 Guides, News, & Discussion] T-lander:
Thanks!

This works on my Xiaomi MI 9 (M1902F1G) too using MIUI 12.0.5 in Sweden. I.e. settings for VoLTE and VoWiFi show up in Settings > SIM Cards & mobile networks > Sim Card Settings for both SIMs in my phone. The status bar doesn't change though, so it seems that my carriers and the current WiFi support neither VoLTE or VoWiFi.

I've included the settings both before and after entering the codes in the dialer.
[Xiaomi Mi 9 Guides, News, & Discussion] amshy:
Wifi Calling Not working for me with Mi 9 Transparent edition!!! i tried my sim with Samsung S21 it work without any problem on the same WiFi network!!! any hints please?
[Xiaomi Mi 9 Guides, News, & Discussion] Marcin_88:
Hi Guys... Any news how to make it running? I have global rom 12.5.2. All codes On I can select on/off but nothing is working. In IMS service are not registered. I asked many times my carrier to actived services and they said that everything is active. I can't find and access any modem config as well.... from CIT option I can go to advanced but when i try to go to modem settings I get error no modem configuration or something similar .
[Xiaomi Mi 9 Guides, News, & Discussion] toscha42:
What's the status information when you enter in the dialer and then open 'Phone Information':

*#*#4636#*#*

If WiFi calling is not enabled try to enable via dialer with the following code:

*#*#869434#*#*

Cheers

Toscha
[Xiaomi Mi 9 Guides, News, & Discussion] Marcin_88:
Is enabled but in IMS services is say - not registered and not alevable. That's the problem. But my carrier said that everything is on. I need to somehow changed modem config but with this version 12.5.2 I don't have any accress
[Xiaomi Mi 9 Guides, News, & Discussion] Marcin_88:
Right now is something streng. I insert simcard to second slot. I disable volte and viowifi and moved back card to slot 1. Now in *#*#4636#*#* sliders are changing on and off
[Xiaomi Mi 9 Guides, News, & Discussion] amshy:
I moved sim to slot 1 but stil not working !!!!
[Xiaomi Mi 9 Guides, News, & Discussion] Marcin_88:
All of this are ative. I think i need to changed modem config but without root is not possible with 12.5.2
[Xiaomi Mi 9 Guides, News, & Discussion] amshy:
Any help please with my rooted device?
[Xiaomi Mi 9 Guides, News, & Discussion] amshy:
This topic helped me, Wifi calling working now )

https://xdaforums.com/t/100-working-guide-for-volte-vowifi-on-mi9-miui-11-no-root-needed.4071673/
[Xiaomi Mi 9 Guides, News, & Discussion] Marcin_88:
Is not working for me. With miui 12.5.2 there is no option to change modem config...I think I will need to reset to factory settings
[Xiaomi Mi 9 Guides, News, & Discussion] amshy:
Did you see the topic?

Try to download "Shortcut Maker" first

Shortcut Maker - Apps on Google Play

Simple app to create shortcut for anything you want.

play.google.com

By the way even i don't live in Africa this option worked with me )
[Xiaomi Mi 9 Guides, News, & Discussion] Marcin_88:
Yes, but with version 12.5.2 you will not find modem config. Xiaomi hide this option I guess
[Xiaomi Mi 9 Guides, News, & Discussion] Lucky-thirteen:
Expert question:

Does anybody know how to connect to Qualcomm PDC tool with Mi 9 on Android 12 AOSP?
[Xiaomi Mi 9 Guides, News, & Discussion] The War Profiteer:
if anyone stumbles upon, you have to be on miui. aosp does not include the required drivers/interfaces.
[Xiaomi Mi 9 Guides, News, & Discussion] mormegil6:
Hello everyone,

I have been trying to run VoWiFi on my Mi 9 for some time (MIUI 12.6, 21.11.24 Beta, Android 11, Magisk 25.2) but to no avail.

I turned off "carrier check" for VoLTE (*#*#86583#*#*) and VoWiFi (*#*#869434#*#*), so I can see the appropriate switches in the phone's network settings.

I looked through this thread and several others, from which I realized that it might be also about "selecting modem config" on the phone. From what I understand, it is turned on with the code *#*#663368378#*#* - but for me, after entering this code, nothing happens. I also tried to enter there in a different way - by clicking on the kernel version I got to the CIT menu, then 3 dots and "additional tools", "MODEM test tools", and "Change Modem Config". At this point I got the message: "No modem config found". I also found some posts about QPST / PDC, but I also don't see any modem configs there to choose from.

Now I wonder if the lack of these configs is maybe due to the ROM I'm using? Or should I download these configs from somewhere and upload them somehow? I've read in this thread, that it could be something related to kernel.prop stuff, but I know nothing about changing this, and if this is still valid method. I would be very grateful for your help. I am currently living in a place with a poor telephone network coverage, WiFi Calling would be very helpful :)