Only MIUI supports VoLTE? - Xiaomi Mi Mix 2S Questions & Answers

Every non-miui rom i've tried cannot make Volte calls. They either fail and say "server unreachable" or it drops from LTE to some unknown status (CDMA I think) and the call quality sounds like something from 10 years ago before HD calling became a thing. And people cant even call me at all. The only option is to disable volte entirely. I've tried the dialer codes and playing with network types, nothing works. You dial someone and it immediately tries to dump LTE. If I flash an official MIUI rom I can play volte calls all day (although I do have to use the special dialer code to disable volte provisioning). Carrier is verizon.

Works fine for me, I'm running latest CrDroid on T-Mobile.

KNO56 said:
Works fine for me, I'm running latest CrDroid on T-Mobile.
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yeah it's a verizon thing, they're so annoying with the way they provision devices.

Can anyone confirm VoLTE switch is still working on stock MIUI 12 for T-Mobile USA? Working for me on MIUI 11.0.5.0 QDGMIXM but I'm holding off on updating to 12 until I know for sure as this is a critical feature for me.

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[Q] VoLTE and WiFi calling

Does anyone know if this phone will ever support VoLTE and WiFi calling on T-Mobile? I was hoping that since the pop astro supports these features, hopefully they'd come to this phone as well.
ffelice said:
Does anyone know if this phone will ever support VoLTE and WiFi calling on T-Mobile? I was hoping that since the pop astro supports these features, hopefully they'd come to this phone as well.
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Unknown but since Hangouts Dialer works fine why not use that for your wifi calls?
According to some, Lollipop was/is supposed to have WiFi Calling baked into the firmware for all the phones running it. And if your SIM card supported it, it would automatically enable it to be used. Have yet to see that though. I don't think this phone will ever get WiFi Calling since it's not a phone released through T-Mobile and doesn't have any T-Mobile software installed. VoLTE on the other hand should be already be supported on the phone.
It doesn't seem likely this phone will receive many updates either. Hope to be proven wrong though in the near future.
I've been using hangouts and it works OK, but gets blocked by my work WiFi requiring that I run a VPN if I want to use it. Hopefully VoLTE will start working, but for now it's not working in an area where I've previously been able to use it with a note 4. Thanks for your input.
I wish they find ways to put wifi calling feature on this thing in tmobile network soon.
Tagging along. I work in a building with a large basement area where I don't get cellular signal, but they have wireless access points installed in the area. It'd be nice to still make/receive calls down there as I'm down there frequently.
Only way we will see WiFi Calling on this device is if we get CM 13 ported over because CM 13 has native built in WiFi calling.
brian117 said:
Only way we will see WiFi Calling on this device is if we get CM 13 ported over because CM 13 has native built in WiFi calling.
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No. You need radio firmware with WiFi calling capabilities. That has nothing to do with CM13. Your device firmware HAS to support it. You will never see WiFi calling at that level with Idol 3.
Where can i able to enable Volte..

VOLTE Three UK

Has anyone got this working, the icon is enabled but it's not showing up.
Volte only works iff you buy a volte compatible phone from 3 shop. It has to be one of there phones or its blocked. Unlike on O2 iff the phone is volte compatible it even works with some of there pay as you go phones. For this reason i am going to leave 3 after my contract finishes.
sam00561 said:
Volte only works iff you buy a volte compatible phone from 3 shop. It has to be one of there phones or its blocked. Unlike on O2 iff the phone is volte compatible it even works with some of there pay as you go phones. For this reason i am going to leave 3 after my contract finishes.
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My last phone was a phone not sold in the UK but that worked?
Which phone was it and where did you buy it I know for a fact that any phone which has volte but not bought through 3 store will have the volte IMS service blocked because you need there version of Android firmware for it to work. I have had many arguments with 3 customer support over this.
the Volte and Wifi Settings are blocked by OP in their official firmware because they need the carrier to allow the settings on their phones. Some Asian imported phone manufacturers sometimes disobey them and allow it but this is not the norm.
Have you noticed that when you put in a sim from a major operator in the uk the internet/mms etc settings are usually auto configured?
three for example, configure their sims to block any 'non authorised' phone to auto download the required settings to enable wifi calling and volte.
This means that the only way of bypassing it (a bit like Sammy csc changing) is if there is a custom ROM available with the three settings pre loaded. EE are the only network that are essentially a 'slut' and allow their settings to (on the most part) be uploaded to any compatible phone.
I get 100 gig a month, unltd calls and text from Three for a ridiculously low £15 per month. I WILL NOT give that up !!!!
as much as i want an OP6 im sticking with a tried and tested Samsung S9 plus that to be frank is just as fast on the most part, and you can easily load three or whatever branded software to enable all the wifi calling and volte goodies.
O2 allow this also. The only real way to get volte working on a non 3 handset is when 3 release there factory stock images eventually and they can be flashed after rooting. Even with custom roms volte will not work for instance lineage etc although volte is implemented still doesnt work. I had bought a lenovo p2 a few years ago and volte did not work for a whole year untill 3 factory images were released and i rooted the phone and installed the 3 firmware then it started working. 3 are real scumbags in this regard.
sam00561 said:
O2 allow this also. The only real way to get volte working on a non 3 handset is when 3 release there factory stock images eventually and they can be flashed after rooting. Even with custom roms volte will not work for instance lineage etc although volte is implemented still doesnt work. I had bought a lenovo p2 a few years ago and volte did not work for a whole year untill 3 factory images were released and i rooted the phone and installed the 3 firmware then it started working. 3 are real scumbags in this regard.
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all u need to get three volte working is essentially the ims settings, ive seen people being able to get three volte and wifi calling working on various grey imports. But agreed its a very convoluted process.
All one plus's use their own firmware, they dont have carrier versions like samsung and others ...
That is correct the only way oneplus would have volte settings is iff 3 sold oneplus on contract otherwise it is a difficult process. I would be very interested nevertheless iff someone in the future figured out a way to get volte working on a non 3 phone other than using there firmware. By the way i am not a oneplus owner but in fact i have a xiaomi mi6 but i am in the same boat ref volte.
sam00561 said:
That is correct the only way oneplus would have volte settings is iff 3 sold oneplus on contract otherwise it is a difficult process. I would be very interested nevertheless iff someone in the future figured out a way to get volte working on a non 3 phone other than using there firmware. By the way i am not a oneplus owner but in fact i have a xiaomi mi6 but i am in the same boat ref volte.
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Unfortunately, I was able to flash the H3G firmware onto my Italian source S8 and use both VoLTE and VoWiFi without ever speaking to Three, same applied to the unbranded S9 I got from CPW SIM free!
sam00561 said:
Volte only works iff you buy a volte compatible phone from 3 shop. It has to be one of there phones or its blocked. Unlike on O2 iff the phone is volte compatible it even works with some of there pay as you go phones. For this reason i am going to leave 3 after my contract finishes.
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I have access to a OP5T and VoLTE and VoWiFi both worked out of the box!
My Pixel 2 - not a chance!
It's easy my dude, there are some bugs with it but hey you can't have both of the best world just yet.
Tutorial : Open Magisk - > Go to Downloads - > Search for VoEnabler - > Reboot - > Activate the VoWiFi and VoLTE in the settings. - > SUCCESS.
Bugs? Only bug I found is that every time someone calls you it will say Unknown (While on VoWiFi, haven't checked on VoLTE yet.)
Let me know how you get on
Three VoLTE working here too using Vo Enabler.
Sorry i am in the weird situation although im not a oneplus 6 owner. I have a xiaomi Mi6 and i used the module voenabler and now i can make calls over wifi but the enhanced Lte option in settings has vanished completely and in the 4636 settings the option for wifi calling became available but the volte option is now greyed out.
I have got VOWIFI working on 3 with pie, I upgraded to 9.0.0 then did this
Dialled *#800#
Went into OnePlus logkit
Went into Function Switch and checked VOWIFI and VOLTE then rebooted
The options now appear in SIM settings and you can turn them on or off.
When I installed 9.0.1 the Function switch options had been removed but as I had already turned them on the SIM options persisted On installing 9.0.2 the Function Switch settings had returned but with a dev test warning.
I have entered airplane mode, turned on WiFi then made and received a call.
The 3 IMS was automatically configured
And some screenshots
I was able to active vowifi but volte is not registering, I did notice that when I connect to WiFi a do a call and during the call I disconnect the WiFi volte start working but only on that call after the call finish it discomect and goes back to no volte. This is on three UK with Pie using the logkit.
@crazdgrunt99 does volte still works for you using the vo enabler?
Got Volte working with 3UK
I got Volte working in my OP6 with 3UK. I used the softwares mentioned here - https://forum.xda-developers.com/oneplus-5t/how-to/guide-volte-vowifi-german-carriers-t3817542
I only installed the softwares mentioned and used *#800# oneplus logkit to enable volte/vowifi options- after that I followed other method used by Jamal , guy who figured out these methods for OP6 (please take EFS backup before this procedure)
Open EFS explorer that is part of qpst software, select your phone , it will start loading directory and files-
Once the directory structure is loaded , go to following path - nv/item_files/modem/mmode
Open the attachment with this post. Delete all files that are same name as in the attachment from Mmode directory in EFS explorer. Note some files are not there. After deletion load the files from attachment to EFS explorer - load as item files - you can select all and load
Reboot phone and it should have Volte working.
Now that A10 is available for the OP6, I can confirm VoLTE working on both OB1 and the production version, at last. (no hacks required)
What about WiFi calling that works too

TELSTRA Australia Users - I have VoWiFi all of a sudden!!??

Cant remember what exactly what I did, but I followed guides here;
https://forum.xda-developers.com/oneplus-7-pro/help/force-enable-volte-vowifi-t3934227
&
https://forum.xda-developers.com/oneplus-7-pro/how-to/guide-activate-volte-vowifi-t4116051
and
The later being the most recent. Whats even more surprising I have previously heavily de-bloated this rom using xXx No Limits to the extent VoWiFI and LTE feature aren't even available (but I understand changes carry forward as they are saved to the EFI partition)
Anyways, going to dive into to see what exact setting I enabled and will post back.
Any other Telstra users notice they have VoWiFI this morning?
Edit: Updated with PDC Setting for Telstra Volte & VoWiFi :laugh::laugh::laugh::laugh:
cantenna said:
Cant remember what exactly what I did, but I followed guides here;
https://forum.xda-developers.com/oneplus-7-pro/help/force-enable-volte-vowifi-t3934227
&
https://forum.xda-developers.com/oneplus-7-pro/how-to/guide-activate-volte-vowifi-t4116051
and
The later being the most recent. Whats even more surprising I have previously heavily de-bloated this rom using xXx No Limits to the extent VoWiFI and LTE feature aren't even available (but I understand changes carry forward as they are saved to the EFI partition)
Anyways, going to dive into to see what exact setting I enabled and will post back.
Any other Telstra users notice they have VoWiFI this morning?
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Would be interested to know. What rom and phone version do you have? GM19?
miffymiffy said:
Would be interested to know. What rom and phone version do you have? GM19?
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Yea, so I know have VOLTE as well!! Really a nice surprise this morning because reception hasn't been the best at home. Anyways,
I have a GM1910 (Chinese ver of One Plus 7 Pro 256Gb / 12GB running OOS 9.5.13 GM21AA with xXx No Limits magisk rom + Kirisakura custom kernel.
I have all installation files backed up as well as some are not hosted by the ops anymore.
What I need to figure out are the specific change I made to the IMEI with the qpst programs... I don't think I did anything to major in the end there, it was months ago and didn't yield any affect.
Any Telstra users have VOLTE and VoWiFi without having done anything!?
I'll post later today my PDC settings
miffymiffy said:
Would be interested to know. What rom and phone version do you have? GM19?
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Updated post with req. PDC setting, can someone confirm if working on their end too?
No such luck on my end. I have the same model and have tried a few versions to no avail. I have had volte pop up before, but the moment I made a call it switched back to 3G. Have you confirmed them to be working? I need vowifi, i have no reception at home. Sick of facebook calling...
miffymiffy said:
No such luck on my end. I have the same model and have tried a few versions to no avail. I have had volte pop up before, but the moment I made a call it switched back to 3G. Have you confirmed them to be working? I need vowifi, i have no reception at home. Sick of facebook calling...
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I just made an additional discovery, you also need to have "My Telstra" app installed as well just as a normal app and have run it at least once then reboot. Have you tried that?
Also, in you Sim settings you have VOLTE and WiFi calling enabled?
Volte and VoWiFi are working here, during call it he phone app will advise call is over vowifi
I'm SOL.
Got a HD1913 1+ 7T Pro.
Tried everything but cant get VoLTE or VoWIFI to work on Telstra.
Running Firmware 10.0.10.HD01AA
Have all the options enabled under Sim1 and through *#*#4636#*#* its all enabled.
Unfortunately no VoLTE sign or VoWIFI when calling. HD symbol works during calls, but thats about it.
Even have the Telstra App installed and full permissions.
UPDATE****
So i put the phone into aeroplane mode and enabled only wifi, tried to do a call and it failed, then BAMMM! VoWIFI enables itself and now I have VoWIFI enabled.
UPDATE 2****
VoLTE has enabled itself too. Looks like the trick for Telstra is to go into aeroplane mode, make a call with wifi enabled only, accept that it says called failed and it should enable VoWIFI and VoLTE.
Happy Days!!!
I'm also on Telstra (Boost mobile) and managed to get VoLTE and VoWIFI working on my OnePlus 7 (non-pro version).
I followed the guide exactly as described here: https://forum.xda-developers.com/oneplus-7-pro/how-to/guide-activate-volte-vowifi-t4116051
After I did all the steps, I rebooted and VOLTE didn't seem to work at first. But then I went into airplane mode and made a call with only Wifi enabled as kw0n2k suggested above. Then VoWIFI and VoLTE started working immediately.
When I was following the guide, the Logkit app preinstalled on my phone didn't have the VoLTE switches so I had to download the Logkit APK they recommended in the post.
For the VoLTE profile, I used "Telefonica_UK_Commercial" as mentioned in the post.

Anyone have WiFi Calling working ?

I'm in the UK and on Three network and have no option for WiFi calling (which i really need as my signal is bad at home). Anyone else have WiFi calling option appear (if so where?). The Mi 10 Pro had it enabled so disappointing this doesn't.
To disable the VoWIFI carrier check, all you have to do is enter *#*#869434#*#* in de phone dialer. The option to place calls over WIFI will then appear in the phone menu. However, some carriers check the type of phone you use or require specific settings in the ROM for it to work. I enabled VoWIFI this way on my device, but it's not working with Vodafone in the Netherlands (at least, not yet).
Appelsap said:
To disable the VoWIFI carrier check, all you have to do is enter *#*#869434#*#* in de phone dialer. The option to place calls over WIFI will then appear in the phone menu. However, some carriers check the type of phone you use or require specific settings in the ROM for it to work. I enabled VoWIFI this way on my device, but it's not working with Vodafone in the Netherlands (at least, not yet).
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That did the trick, thank you so much !!
orbital247 said:
That did the trick, thank you so much !!
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Where are you located and what carrier?
gigaflop said:
Where are you located and what carrier?
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It's in the original post... UK and Three
Works ok on EE using EU ROM, see screenshot
Works ok on Vodafone UK too.
I'm using a Giffgaff and an EE SIM to see which gives better data and the option isn't enabled for Giffgaff (they don't offer it)
So at least in the EU ROM it is up to the carrier with no extra steps the user's end.
I installed EU rom on my Mi 10 ultra and now I no longer have VoWiFi in the settings, and VoLTE is greyed out and can't be clicked! I tried *#*#869434#*#* and got a message that saying VoWIFI is enabled, but it's not working.
Everything was working fine in China rom!!
Update: fixed!
hammody said:
I installed EU rom on my Mi 10 ultra and now I no longer have VoWiFi in the settings, and VoLTE is greyed out and can't be clicked! I tried *#*#869434#*#* and got a message that saying VoWIFI is enabled, but it's not working.
Everything was working fine in China rom!!
Update: fixed!
Click to expand...
Click to collapse
What fixed it?
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*
After dialing these codes make sure the notification says "carrier check disabled" NOT ENABLED.
The trick is you need to restart your phone after enabling them.
hammody said:
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*
After dialing these codes make sure the notification says "carrier check disabled" NOT ENABLED.
The trick is you need to restart your phone after enabling them.
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Good job. TYVM
it definitely works but call quality was really bad the one time I tried it
Sathelp said:
Works ok on EE using EU ROM, see screenshot
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I'm UK on EE too... received phone today. Going to start the unlock tonight. Looking online, I note that both the "stable" EU and "weekly" EU appear to have snags - would have thought that the 'stable' would be pretty snag free. Do you recommend the EU ROM, or should I just go ahead with staying on Chinese for a while? I've flashed stuff before on older phones but want to try and keep this one as daily driver where poss, so most 'normal' stuff needs to work pretty much (android auto/vowifi+volte/voice recording/banking/fingerprint).
Would appreciate your input.
If Google pay is important, I mean really important, then stay on stock for now as gpay has an issue, or I should say both stable and weekly seem to have developed a CTS security problem that stops gpay and stops fingerprint banking, normal logins work still though. It should be all good and pass all safetynet tests, so hopefully fixed in next version after Chinese holidays, so around 15 or 16th October as all EU ROMs are based on official ones.
VoLTE and VoWiFI works fine with EU ROM but I am not so sure with the Chinese stock, so one to test.
Call recorder works on all versions really well but you ask about auto, not had any use of it but location history or tracking does not work on their Google framework version but these are fine on the full Google framework set of apps on the EU ROM.
Yes, stable is the most recent so called fully working version with weekly built in top since last stable. Do not switch between each, choose one branch or the other or you may need to wipe your data swapping between the two.
Unlocking does not affect anything but you do need to fully verify your mi account before you start or you will get nowhere. Once done you can start the unlock. The tool will take you to a point where you need to add your mi account and password to the phone to bond the 2 together, then it will start your countdown, 168 hours, one week. Come back after and use the unlock tool again and this time it will unlock, wipe and reboot, so make sure you have a back up or somewhere to get your data back on like your old phone and a copy of mi move. Then you can flash away or stay stock Chinese.
I have attached a copy of my guide to unlock, twrp and ROM flashing, I know you have done some before but it may help you or someone else reading. Oh and one final thing, read as much as you can here and in the Xiaomi.EU forums mi 10 ultra and ROM threads.
Work on Xiaomi Mi 10 Ultra in USA
Sathelp said:
Works ok on EE using EU ROM, see screenshot
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Sorry to dredge up an old post (I'm EE UK on weekly EU rom).
Can you get SMS to send when on VoWifi, as I'm still getting message send failed (using Pulse SMS)? Calling works, of a sort - quality is poor. Also noticed that sometimes I don't get the VoWifi indicator when out of service area
It sends while on VoWiFI SIM 2 on EE using Mi Message, the stock message app. See screenshot
Hi, I'm having issues with VoWIFI. It never worked on EU Weekly. I see, and enabled the VoWIFI option in the settings, but never works.
VoLTE used to work, but stopped after the last week update (10.12.2020). Since the last weekly update, VoWIFI option disappeared, and VoLTE is greyed out.
I put my SIM in an iPhone and everything was working fine!
I use EU weekly and don't have any issues. My Sky SIM does not but my EE SIM 8n SIM too works a treat. Screenshot attached shows VoWiFI call.
Sometimes the icon dissappears, so I just switch off Wi-fi and back on, service back.

VoLTE on Vision + T-mobile?

Just curious if anyone out there is using a Moto One Vision in the US on T-mobile with Kane flashed and VoLTE support. I went through the serial stock ROM upgrades from 9 to 11 and with the installation of 11, VoLTE became active. Interested in flashing the latest Kane ROM, but can't afford to lose VoLTE support.
So I went ahead with the flash last night, and it worked perfectly. It actually works better than the stock Motorola ROM. The stock ROM had LTE/VoLTE but no VoWIFI. Lineage Kane (1/14/23) actually had LTE/VoLTE (even during a call) and somehow turned on VoWiFi.
Zero complaints. The smoothest ROM flash I've ever done.
An update: VoWifi (Wifi calling) doesn't actually work. Although the menu slider is present and it can be turned on, and the VoWiFi calling slider on the main *#*#4636#*#* engineering menu can be turned on, if you look at phone information it shows as Unavailable despite IMS being registered and VoLTE being available.

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