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Mi A1: WiFi Calling does not work on T-Mobile in US

Just got off a multi-hour chat with T-Mobile tech team in US: they confirmed that they can't make WiFi Calling work on my Xiaomi Mi A1 (Global). Regular calling (Band 4) works fine.
Quote from out chat:
I have reached out to the highest level of Specialized Tech Care, and worked with them on the provisioning issues. With the Xiaomi MI A1 being a non-T-Mobile non US based phone, the option may show as available, but the device itself will not actually operate on, or use the wi-fi calling options. We can absolutely help you get into a device that supports the feature, but there is not a way to activate it on that device.
The provisioning failure is on both sides, we cannot activate the service, nor force an override to update the IMS.
The plan is setup and good to use it, but the systems are giving us an error saying that the feature is unsopported.
Click to expand...
Click to collapse
Symptoms and details:
Phone is a Global version with Oreo 8.0.0 and the latest security patch (Feb 1, 2018), not rooted, fully stock.
I tried enabling WiFi Calling in the Phone dialer app to no avail (Hamburger menu → Settings → Calling Accounts → T-Mobile → Wi-Fi Calling)
T-Mobile tried re-provisioning the phone. Their system was sending a special sms to enable WiFi Calling. It was understood by the phone, so I was seeing it as a regular text message:
FREE T-MOBILE SUPPORT MSG. Q's? See <REDACTED LINK TO TMOBILE SUPPORT SITE> WQGxYT92fBTCECnvS4QOiu7gzm4NPHiWMYoeXEs5riY=:WFCn|414b7f5b
Click to expand...
Click to collapse
Debug menu (*#*#INFO#*#* in the dialer) is still showing IMS Service Status → IMS Registration: Not Registered.

It sucks that voLTE doesn't work on T-Mobile US as well. It's what I expected when I got the phone anyways, so I can't complain too much.

yup sucks. regular calls is alright but to make up no VoLTE or wifi calling I just use google duo calls to my friends and it sounds excellent. only downside is I can only use it with people who only have duo installed.

VoLTE works great with this device.
Ps from India

It's so weird that my mobile company supports VoWifi and VoLTE but the phone doesn't seem to understand that. No option to enable and when i force enable it via shortcutMaker it disables itself. I double check that it's enabled by calling the company and they say that if my smartphone supports it, it sould be enabled by now...

Volte works fine here in my country

VoWiFI doesnt work in Greece, too.

[Guide]Enable VoLTE forcefully if Its not activated by default

As Title Speaks, Here is Little Workground for Enable VoLTE for OP6
Limitations :-
1. Sim Must be 4G Enabled.
2. You must Live under VoLTE Enabled Circle.
3.
Steps :-
1. Open Dialer
2. type USSD code *#*#4636#*#*
3. Select phone information
4. Now select Network type *LTE/UMTS auto(PRL)
5. Reboot..
6. Done
Go in Settings
Check if Both sim have VoLTE option Enabled
Also enable Data Roaming
Hope you get VoLTE..
I got VoLTE this way.. So just sharing..
Now Here is Bug with Vodafone VoLTE, when Trying to call, Network get bounced to 2G network.. It's Bug & Already reported to OnePlus..
If you still can't get VoLTE, Wait for Update.. ??

Doesn't work for me, no volte option under both sim settings and phone info switches back, TD-SCDMA/CDMA/UMTS

neo387 said:
Doesn't work for me, no volte option under both sim settings and phone info switches back, TD-SCDMA/CDMA/UMTS
Click to expand...
Click to collapse
There should be VoLTE option for your sim..
If no, There is many chances that your SIM maybe not 4G ready or your circle don't have VoLTE feature..

neo387 said:
Doesn't work for me, no volte option under both sim settings and phone info switches back, TD-SCDMA/CDMA/UMTS
Click to expand...
Click to collapse
Needs root but the only way I got it to work here is with the magisk module.

Ya, don't go playing with the band selection, or you may just get dropped to 2g connection with no LTE possible.
After digging around, I found a fix to get LTE back.
Download the "Network Signal Guru" app from the Play Store.
I told it to "Clear Forcings" in the menu, and LTE is back up.

Cantn find The Module can You give some more Informationen?

This won't work in Europe at least, no matter how Volte ready is your network/SIM card. OnePlus just ignores the issue.

This method https://forum.xda-developers.com/on...-volte-vowifi-german-carriers-t3817542/page28 works for activating VoLTE if your operator had enabled it for you.
I tried the method in the current post, but only got the toggles in the menu and not the real thing.
Had to call the mobile operator (Telenor BG, Bulgaria) to ask them to activate VoLTE and then did the method in the linked post.
I have a non-rooted OP6 and I'm now effectively using VoLTE on my network. Hope that helps.

Hmmm, does anybody know which was the previous default setting? I would like to revert it back and don't remember what setting was set before...

fourcc said:
hmmm, does anybody know which was the previous default setting? I would like to revert it back and don't remember what setting was set before...
Click to expand...
Click to collapse
td-scdma / cdma / umts

CYB3R0ID694 said:
As Title Speaks, Here is Little Workground for Enable VoLTE for OP6
Limitations :-
1. Sim Must be 4G Enabled.
2. You must Live under VoLTE Enabled Circle.
3.
Steps :-
1. Open Dialer
2. type USSD code *#*#4636#*#*
3. Select phone information
4. Now select Network type *LTE/UMTS auto(PRL)
5. Reboot..
6. Done
Go in Settings
Check if Both sim have VoLTE option Enabled
Also enable Data Roaming
Hope you get VoLTE..
I got VoLTE this way.. So just sharing..
Now Here is Bug with Vodafone VoLTE, when Trying to call, Network get bounced to 2G network.. It's Bug & Already reported to OnePlus..
If you still can't get VoLTE, Wait for Update.. ??
Click to expand...
Click to collapse
It doesn't work with Kuwait Viva !

If you want to get VoLTE and VoWiFi menu under SIM options in your OP6 just type *#800# in default dialer (not working in ther dialers) and under oneplus logkit>Function switch there is VoLTE and VoWiFi switch This is only to have that switch visible in menu so it isnt a guarantee that VoLTE will work on your device because your network carrier must support it and if it is not supported by carrier then VoLTE will not work no matter if you enable it with menu switch

Follow my Guide to activate VoLTE and VoWiFi for OnePlus 6...

is there a way to fix volte on pie beta 1?
I was using VoLTE-OEM-Lab on 5.1.11

jamal2367 said:
Follow my Guide to activate VoLTE and VoWiFi for OnePlus 6...
Click to expand...
Click to collapse
Thanks, I used your guide and was able to enable VoLTE for my Vodafone.de LTE contract, my second card is from Sparhandy which is also I believe Vodafone but without LTE/4G, unfortunately VoWIFI is not showing up, I confirmed with Vodafone/LTE contract that it is enabled and it is, any suggestions?
TIA

somebody knows how to set up VoLTE on OOS9 ?
"Enhanced networking" missing for me

No one in Pie tried to set up VoLTE

VoLTE and VoWiFi just work, what setting up needs done?
---------- Post added at 08:17 AM ---------- Previous post was at 08:15 AM ----------
jabs said:
somebody knows how to set up VoLTE on OOS9 ?
"Enhanced networking" missing for me
Click to expand...
Click to collapse
Go to "Phone", Settings, SIM & Network Settings, then in to the SIM you want, and the VoLTE and WiFi calling is in there. It's NOT in the traditional Settings app.

jabs said:
No one in Pie tried to set up VoLTE
Click to expand...
Click to collapse
jamal2367's method (see here in English: https://forum.xda-developers.com/oneplus-5t/how-to/guide-volte-vowifi-german-carriers-t3817542) works fine with OOS9/Pie.
Just updated & patched modem config with PDC as described in the link (I'm using the config "Telefonica_UK_Commercial" for O2 in Germany) and I'm up again with VoLTE/VoWifi working..
Still a shame that Oneplus is incapable to do enable the right config by default..

but it is just that in OOS9 you miss those switches what were in OOS5.11 in "Enhanced networking, this group is all missing in Pie

[Help] OP6 VoWiFi - Incoming Calls show as unknown number

Hey everyone, long time lurker first time poster here!
I recently bought a Oneplus 6 to replace my Oneplus 3T and it is awesome. My network is id mobile in the UK, and it does provide VoLTE and VoWiFi, but not to many handsets.
I quickly rooted and installed Magisk thanks to the guide showing how to root and install Magisk without TWRP.
One if the first things I did was install VoEnabler, and after a quick reboot I had WiFi calling enabled, tested, and working on my phone!
I noticed today that any incoming calls over WiFi will display as an unknown number. As soon as I turn off VoWiFi incoming calls display correctly. Looking back through my call history over the past week all incoming calls display as. Unknown number or private number, but no outgoing ones.
I've tried a few things but no luck so far:
Network settings reset
Installed Google contacts and dialler
A few different changes to BuildProp
Nothing has worked, so I have disabled VoEnabler and manually added the following to by build prop:
persist.dbg.ims_volte_enable=1
persist.dbg.volte_avail_ovr=1
persist.dbg.vt_avail_ovr=1
persist.dbg.wfc_avail_ovr=1
persist.radio.rat_on=combine
persist.radio.data_ltd_sys_ind=1
persist.radio.data_con_rprt=1
persist.radio.calls.on.ims=1
Which is basically what VoEnabler adds anyway.
I have a feeling I'm missing something that might be obvious to someone better than I am.
Since my network natively supports WiFi calling and VoLTE to Huawei P20, lite and Pro too, I wondered if there was maybe a build prop entry one of those phones had that I might have to add. Honestly I'm not sure.
Apologies if this is in the wrong section, and thanks to anyone that can offer some advice!
Update Edit:
I've also found that I don't have the WiFi provisioned toggle in the phone information by dialling *#*#4636#*#*, maybe this has something to do with it

A quick update to this,
VoLTE works just as well as VoWiFi, but it has the same issue with incoming calls showing as unknown number...
Will continue looking and post results here

[Guide]Enabling VoLTE on stock ROM (Calls and SMS)

Hi all.
I just want to post a guide for people wondering how to enable VoLTE in unsupported countries. Apparently, Xiaomi only enable VoLTE for SEA countries etc. and Japan (Where I'm staying) is not supported.
So, I have been having problems receiving SMS and calling other numbers. After reading this blog post, I have solved that problem and maybe I can help others solving this problem. This is the procedure written in the blog post in English.
1. Setting APN (Might not be applicable for other countries)
-----------------
for Au user with VoLTE enabled sim, create a new APN and set it as below
・NAME:ims
・APN:ims
・MCC:440
・MNC:51
・TYPE:ims
for DoCoMo user with VoLTE enabled sim, create a new APN and set it as below
・NAME:ims
・APN:ims
・TYPE:ims
・APN protocol:IPv4v6
2. Go to dial and dial *#*#86583#*#* . It should show carrier check disabled or something along the lines.
3. If the phone does not have a signal after step 2. reboot the device and it should connect after that.
Hope this will help anyone who is having trouble enabling VoLTE.

thanks man . *#*#86583#*#* did worked for me in Sri lanka

Dilesh Perera said:
thanks man . *#*#86583#*#* did worked for me in Sri lanka
Click to expand...
Click to collapse
I'm glad I was able to help

its a pity there's not such a short code to enable the VoWifi in the same way
EDIT:
Turns out setprop persist.dbg.wfc_avail_ovr 1 enables the switch, but the service still shows as unavailable.
using the build.prop changes I came up with for this https://forum.xda-developers.com/oneplus-5/themes/magisk-volte-enabler-t3649647
enables UT interface.

Volte Restore
Run the below code in your dialer app manually. You should see a message stating "Volte Carrier check disable" else run the code again.
After 30 seconds your volte network should be retored. Pull down the notification bar to check for the volte symbol.
*#*#86583#*#*
Cheers!!

Hi
Thanks for this topic.
I have a problem : my poco F1 (MIUI Global 10.3.5.0) says it is enabled only for SIM1.
But as I use a µSD card (which has to be plugged instead of SIM1) I only have SIM2 place to put my SIM.
So I only have SIM2, no SIM1, and my poco says "only for SIM1"...... WTF ?!!
Someone has an idea for having VoLTE (and VoWiFi) on SIM2 ???
Thanks !

volte and wifi calliing

hi was wondering if there is any way how to enable volte and wifi calling? im using tmobile i dont see volte anywhere without root if possible for now?
Thanks

raven213 said:
hi was wondering if there is any way how to enable volte and wifi calling? im using tmobile i dont see volte anywhere without root if possible for now?
Thanks
Click to expand...
Click to collapse
VOLTE should work out of the box.

raven213 said:
hi was wondering if there is any way how to enable volte and wifi calling? im using tmobile i dont see volte anywhere without root if possible for now?
Thanks
Click to expand...
Click to collapse
Have you tried, *#*#86583#*#, to see if that works for you?

jcsww said:
Have you tried, *#*#86583#*#, to see if that works for you?
Click to expand...
Click to collapse
yeah i just dont see volte on my phone lol plus when i make a call it changes to 4g

raven213 said:
yeah i just dont see volte on my phone lol plus when i make a call it changes to 4g
Click to expand...
Click to collapse
4G is technically LTE. The Xiaomi firmware doesn't seem to have an LTE icon, at least not that I have seen. 4G and 4G+ are LTE and LTE-A.

jcsww said:
4G is technically LTE. The Xiaomi firmware doesn't seem to have an LTE icon, at least not that I have seen. 4G and 4G+ are LTE and LTE-A.
Click to expand...
Click to collapse
thanks for the info

After the *#*#86583#*#, try going into Mobile & Networks, and select your SIM card. There should be a VoLTE enabled option now. This option didn't show up for me until I did that and then I had to turn it on.
There's now a tiny VoLTE icon in the notification bar and when I'm on a call, it stays there.

Try code *#*#869434*#*# to disable VoWIFI check. And check if it working on T-Mobile.
I don't have Tmobile to check it.

mohanparvatham said:
Try code *#*#869434*#*# to disable VoWIFI check. And check if it working on T-Mobile.
I don't have Tmobile to check it.
Click to expand...
Click to collapse
No, VoWifi doesn't work on t mobile

What ROM's have people tried for WiFi Calling? Does the OP refer to T-Mobile in the UK/EU or USA? The Global Stable seems to have some less features compared to the Chinese Stable. I had Advanced Messaging working in the default text app when I was on Chinese Stable by doing nothing but it does not seem to work on the Global Stable.

got volte working on tmobile US just not wifi calling but its fine

raven213 said:
got volte working on tmobile US just not wifi calling but its fine
Click to expand...
Click to collapse
Which ROM is your device using? I really want to flash my green one back to the Chinese Stable. Global Stable just isn't as good in my opinion.

jcsww said:
Which ROM is your device using? I really want to flash my green one back to the Chinese Stable. Global Stable just isn't as good in my opinion.
Click to expand...
Click to collapse
Eu global the lastest one 10.2.2.0

Ever find a solution to this? I am on MIUI Global 10.3 (Stable) and am able to turn off Mobile data( T Mobile is my carrier in U.S.) and with my WiFi on the device i can still make and receive phone calls. In this configuration i obviously still see my WiFi symbol in the Notification bar as well as the VoLTE symbol. Don't know if this will help you at all, but it is some stuff i have noticed recently when i was trying to figure out why T-Mobile apps dont work on my Mi Mix 3.
With WiFi turned off and Mobile Data turned on i am able to make phone calls(obviously) with VoLTE and am able to see the LTE+ symbol in the Notification bar as well.
If i go to About Phone --> Tap "Internal Storage" 4 time(brings you to the Testing Menu) and looking into the Phone Info i see the following...
Set Preferred Network Type: LTE/TD-SCDMA/UMTS
Mobile Radio Power: On
VoLTE Provisioned: Off
Video Calling Provisioned: Off
WiFi Calling Provisioned: Off
EAB/Presence Provisioned: Off
When i bring this menu up on my previous phone(LG G7 ThinQ) i see that the Preferred Network type was different...so i changed my Mi Mix 3 just to match to see how it would change
My LG G7(without a SIM inserted) shows the following
Set Preferred Network Type: LTE/UMTS auto (PRL)
Mobile Radio Power: On
VoLTE Provisioned: On
Video Calling Provisioned: On
WiFi Calling Provisioned: On
EAB/Presence Provisioned: Off
Changing the network type on my Mi Mix 3 didnt do much, however when i changed it LTE/CDMA/UMTS auto(PRL) the VoLTE Provisioned and Video Calling Provisioned both switched to "On".
I dont quite understand this so for the most part i have just left it to match my LG's setting since i can change the network type back to LTE/UMTS auto(PRL) after and the settings stay set to "On"
Made a few test phone calls after with WiFi on and off, everything seems to work just fine regardless of what the phone displays.

[email protected] said:
Ever find a solution to this? I am on MIUI Global 10.3 (Stable) and am able to turn off Mobile data( T Mobile is my carrier in U.S.) and with my WiFi on the device i can still make and receive phone calls. In this configuration i obviously still see my WiFi symbol in the Notification bar as well as the VoLTE symbol. Don't know if this will help you at all, but it is some stuff i have noticed recently when i was trying to figure out why T-Mobile apps dont work on my Mi Mix 3.
With WiFi turned off and Mobile Data turned on i am able to make phone calls(obviously) with VoLTE and am able to see the LTE+ symbol in the Notification bar as well.
If i go to About Phone --> Tap "Internal Storage" 4 time(brings you to the Testing Menu) and looking into the Phone Info i see the following...
Set Preferred Network Type: LTE/TD-SCDMA/UMTS
Mobile Radio Power: On
VoLTE Provisioned: Off
Video Calling Provisioned: Off
WiFi Calling Provisioned: Off
EAB/Presence Provisioned: Off
When i bring this menu up on my previous phone(LG G7 ThinQ) i see that the Preferred Network type was different...so i changed my Mi Mix 3 just to match to see how it would change
My LG G7(without a SIM inserted) shows the following
Set Preferred Network Type: LTE/UMTS auto (PRL)
Mobile Radio Power: On
VoLTE Provisioned: On
Video Calling Provisioned: On
WiFi Calling Provisioned: On
EAB/Presence Provisioned: Off
Changing the network type on my Mi Mix 3 didnt do much, however when i changed it LTE/CDMA/UMTS auto(PRL) the VoLTE Provisioned and Video Calling Provisioned both switched to "On".
I dont quite understand this so for the most part i have just left it to match my LG's setting since i can change the network type back to LTE/UMTS auto(PRL) after and the settings stay set to "On"
Made a few test phone calls after with WiFi on and off, everything seems to work just fine regardless of what the phone displays.
Click to expand...
Click to collapse
Put the device in airplane mode, then turn on WiFi. Can you make calls? I can't! Turning on WiFi and enabling WiFi Calling doesn't mean the calls are going over WiFi. Especially if you are still seeing VoLTE or any time of mobile network connection.
Edit: Go down to the very bottom, hit more, hit IMS status, and see what it says.

Yeah I looked at the IMIS before, voice over wifi has always(I assume) said not unavailable

[email protected] said:
Yeah I looked at the IMIS before, voice over wifi has always(I assume) said not unavailable
Click to expand...
Click to collapse
No access to the IMS settimgs is more than likely why we can't get it working. We cam't see the settings to even compare them to what they should be.

I am on MIUI Global 10.3 (Stable) / Chinese Device / T-Mobile Germany.
VoWiFi as well as VoLTE are working on my device, however you need root access to enable the VoWiFi profile.
Once it is working you will see the WiFi calling icon in the status bar.
I was following this guide to enable WiFi calling on the Mi Mix 3:
https://forum.xda-developers.com/poco-f1/how-to/guide-activate-vowifi-wlan-call-t3871263
I don't know if the mentioned profile will work in other countries as well but maybe someone with more insight can shed some light into this.
I remember that VoLTE was working out of the box, you just have to disable the carrier check with the USSD code to make it available in settings.
VoWiFi can be enabled via USSD code as well, however even after changing the setting to enabled and preferred WiFi calling it does not register without the profile change.
VoLTE: *#*#86583#*#*
VoWiFi: *#*#869434#*#*
I had to redo the profile change after each upgrade with TWRP, since the firmware partitions get updated as well.
I hope this will help. :fingers-crossed:

I have Mix 3 with U.S T-Mobile service. After disabling the VoWiFi check with *#*#869434#*#*, the option for WiFi calling check box appears under the T-Mobile SIM section, but WiFi calling is not working when tested under airplane mode with WiFi enabled.

Vowifi works fine on MTS (Russia). All you need:
1. Activate vowifi service from the operator
2. Disable service check by command: *#*#869434#*#*
3. Create folder into: /system_root/system/priv-app/MBNLoader
4. Copy into this folder APK: MBNLoader.apk (View attachment MBNLoader.apk
5. Give right privileges: -rw-r--r--
6. Reboot phone
7. Install from play market QuickshortcutMaker: https://play.google.com/store/apps/details?id=com.sika524.android.quickshortcut
8. Open it and go to tab apps
9. Find Modem Config
10. Open it (tap) and you will see a lot of MCFG Modem configs.
11. Try one by one to start vowifi working
12. Enjoy!
Screenshots: