Dual-4G not working properly - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

Hello.
I have a Mi 9T Pro with 9.11.14 weekly xiaomi.eu - ROM
I have 2 SIM-cards (2 different operators)
SIM1 for calling and SMS
SIM2 for data
Settings -> Preferred network -> GSM/WCDMA/LTE on both
Both are connected in 4G-mode
The problem is that i don´t receive sms or can´t dial out with SIM1 in that situation.
only if i disable the data-connection of sim2 or change the network mode from SIM1 to gsm/wcdma
i thought the Mi 9T Pro can handle two 4G "connections" at the same time.
Am i wrong?
Or is it a firmware / ROM bug?
can someone confirm this or i´m the only one having this issue

so for everyone this is working?

SeMo87 said:
Hello.
I have a Mi 9T Pro with 9.11.14 weekly xiaomi.eu - ROM
I have 2 SIM-cards (2 different operators)
SIM1 for calling and SMS
SIM2 for data
Settings -> Preferred network -> GSM/WCDMA/LTE on both
Both are connected in 4G-mode
The problem is that i don´t receive sms or can´t dial out with SIM1 in that situation.
only if i disable the data-connection of sim2 or change the network mode from SIM1 to gsm/wcdma
i thought the Mi 9T Pro can handle two 4G "connections" at the same time.
Am i wrong?
Or is it a firmware / ROM bug?
can someone confirm this or i´m the only one having this issue
Click to expand...
Click to collapse
Might seem like an inane question but still have to ask - SIM1 is actually 4G enabled right?
When you have both in 4g post screenshots of *#*#4636#*#*# - > cell network info

Hi I'm having the same problem.
When I first got the phone a few months it was working fine I would see the 4g symbol on both the network strength icon. Ever since the last update it stopped, I just updated it again today hoping it was fixed but nope. I have checked settings and enabled to allow for dual 4g. One thing I have noticed is when turn the dial 4g option on and off the 4g symbols are visible on both network strength incons for a split second then it only it shows it one of them again. Is there an issue or fix for this ?
Thanks

Related

Call Issue in S10 in Exynos Indian Variant

Hello Guys,
I am having a weird issue in my S10 regarding call.(Using Airtel)
I am unable to call anyone through the phone if the Network mode is set to anything other than LTE/3G/2G (auto Connect) (e.g - 2G Only , 3G/2G and so on).
Other the LTE mode , when I try to call someone the call gets cut immediately without any message , ring or anything else.
I tried putting the sim card in my Redmi Note 5 pro and set it to 2G mode , and it worked several times.
So can anyone provide a solution or if anyone can confirm whether they are facing this issue or not?
subhad43 said:
Hello Guys,
I am having a weird issue in my S10 regarding call.(Using Airtel)
I am unable to call anyone through the phone if the Network mode is set to anything other than LTE/3G/2G (auto Connect) (e.g - 2G Only , 3G/2G and so on).
Other the LTE mode , when I try to call someone the call gets cut immediately without any message , ring or anything else.
I tried putting the sim card in my Redmi Note 5 pro and set it to 2G mode , and it worked several times.
So can anyone provide a solution or if anyone can confirm whether they are facing this issue or not?
Click to expand...
Click to collapse
Hello, which carrier do you have? In my case i have Idea which fails to provide a 4g+ service in certain area/region followed by which you cannot call or receive calls on LTE/3g/2g. Try using a different sim card which has 4g+ service in your area/region.
Regards
Mandark52 said:
Hello, which carrier do you have? In my case i have Idea which fails to provide a 4g+ service in certain area/region followed by which you cannot call or receive calls on LTE/3g/2g. Try using a different sim card which has 4g+ service in your area/region.
Regards
Click to expand...
Click to collapse
I am using Airtel 4G. There is 4G in my region, the issue is I can call when its set to LTE (4G). But setting the network to 2G or 3G causes the issue. I tested the 2G and 3G in my Redmi Note 5 Pro and they are working in that phone so I believe it's not regional issue.
Anyway I will do a factory reset to check if it works(Tried settings reset and network reset. None of them resolved the issue).
subhad43 said:
I am using Airtel 4G. There is 4G in my region, the issue is I can call when its set to LTE (4G). But setting the network to 2G or 3G causes the issue. I tested the 2G and 3G in my Redmi Note 5 Pro and they are working in that phone so I believe it's not regional issue.
Anyway I will do a factory reset to check if it works(Tried settings reset and network reset. None of them resolved the issue).
Click to expand...
Click to collapse
I have the same combo and 2g calls works just fine.
Updated to the latest may patch.
mehra1 said:
I have the same combo and 2g calls works just fine.
Updated to the latest may patch.
Click to expand...
Click to collapse
I Did factory reset today. Its working fine now. Thanks for all the help

Miui 11 and voLTE missing

After I install miui 11 the option volte in setting Is missing.
Mi 9 Eu version .
Same here...?
At me is still there and working as usual.
I didn't touched anything before and after new ROM installation so it's really strange.
In my as well dissapear.
But call when im in 4g still working.
Sent from my MI 9 using Tapatalk
In mine when call change in H+ from 4g
alessio81pa said:
After I install miui 11 the option volte in setting Is missing.
Mi 9 Eu version .
Click to expand...
Click to collapse
Here also. As a workaround you can disable VoLTE Carrier check (*#*#86583#*#*). This works at me.
For me it appeared in the settings with the update, but still cannot activate it
I have the same problem pls try
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*
It's work
pnx2york said:
I have the same problem pls try
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*
It's work
Click to expand...
Click to collapse
For my case, VoLTE was operational before the upgrade (using 10.3.11 international version on my Mi9T in Vodafone GR). An icon was displayed for VoLTE on the carrier signal in my mobile's screen when it was connected in 4G.
Now it does not work anymore (upgraded yesterday to MIUI 11.0.1 international version, no icon when connected in 4G networks and actually drops to 3G when performing a call so it gets circtuit switched and not IP based via IMS). Of course it is not a matter of settings to disable carrier checks (as already done/undone several times, reboot etc, since it was in disabled state already and the settings are there to enable/disable VoLTE and VoWiFi).
VoWiFi still works but only when using Vodafone's application for WiFi calling.
orestis46 said:
For my case, VoLTE was operational before the upgrade (using 10.3.11 international version on my Mi9T in Vodafone GR). An icon was displayed for VoLTE on the carrier signal in my mobile's screen when it was connected in 4G.
Click to expand...
Click to collapse
How did you enable Volte and ViWiFi on Vodafone Greece? I also have a mi 9t and cannot enable them. Can you help. Thanks!!
Dr.Scythe said:
How did you enable Volte and ViWiFi on Vodafone Greece? I also have a mi 9t and cannot enable them. Can you help. Thanks!!
Click to expand...
Click to collapse
Contact Vodafone GR (even their website and use chat to request VoWiFi/VoLTE service for your mobile number), they will handle it. Meanwhile you can also use *#*#VOLTE#*#* and *#*#VOWIFI#*#* settings to check that are in disabled state. You should be able to see VoLTE and VoWiFi settings (enable/disable etc) in your Sim cards & mobile settings (pick your Vodafone SIM settings then).
orestis46 said:
Contact Vodafone GR (even their website and use chat to request VoWiFi/VoLTE service for your mobile number), they will handle it. Meanwhile you can also use *#*#VOLTE#*#* and *#*#VOWIFI#*#* settings to check that are in disabled state. You should be able to see VoLTE and VoWiFi settings (enable/disable etc) in your Sim cards & mobile settings (pick your Vodafone SIM settings then).
Click to expand...
Click to collapse
I have Vodafone in Italy the same problem but I wouldn't know how to insert the writing in the numeric keypad I just slip the symbols.
There're characters below the numbers.
Then *#*#VOLTE#*#* is keyed in as *#*#86583#*#*.
Cheers
Toscha
toscha42 said:
There're characters below the numbers.
Then *#*#VOLTE#*#* is keyed in as *#*#86583#*#*.
Cheers
Toscha
Click to expand...
Click to collapse
then I had already tried, but with Vodafone in Italy it was not activated, on the Miui 10 the button was available..
Mi 9 miui 11.0.5 volte vowifi dual 4g options missing
Hello ,
Mi 9 bought from Greece you.gr after miui 11 android 10 upgrade, volte vowifi and dual 4g options missing !
Also sms app fails to send sms if the Use GSM alphabet option is enabled!
*#*#VOLTE#*#* and *#*#VOWIFI#*#* solves the issue! i don't no if there is similar code for dual 4g enable or it not needed and just works!
I am using only one sim card cosmote, so i can't check the dual 4g!
Thank u
Dialing the code "*#*#86583#*#*, the message "volte carrier check disabled" is shown. Then I can toggle the VoLTE option in settings, and it works when making a phone call. Look at the screenshots I attached.
Phone: Xiaomi Mi 9
Contry: Italy
Carrier: TIM
Screenshots:
https://ibb.co/WxQZBKc
https://ibb.co/7QfsDyP
menego_matteo said:
Dialing the code "*#*#86583#*#*, the message "volte carrier check disabled" is shown. Then I can toggle the VoLTE option in settings, and it works when making a phone call. Look at the screenshots I attached.
Phone: Xiaomi Mi 9
Contry: Italy
Carrier: TIM
Screenshots:
https://ibb.co/WxQZBKc
https://ibb.co/7QfsDyP
Click to expand...
Click to collapse
OMG THANKS
It's work !!
In Miui 10 this code don't work for me , and now it's work
Country : France
Carrier : Sosh(Orange)
Johniiii said:
I am using only one sim card cosmote, so i can't check the dual 4g!
Thank u
Click to expand...
Click to collapse
Just returned from a trip to Thailand. VoLTE and ViWiFi work on both sim cards, Telekom (DE) and AIS (TH).
Cheers
Toscha
Edit : VoLTE is activate...but don't work.....
Hi, I got a Mi 9 SE. I activated volte and wifi call with the codes under MIUI 10 some weeks ago. Volte and Wifi Call worked like a charm.
Now I received the Miui 11 update some days ago. Unfortunately Volte and Wificall stopped working.
Reentering the codes worked, but with enabling Carrier check again ...
Strange thing is that in settings the option to enable Volte and wifi call is still visible and activated - but I can't see the volte logo und it obviously doesnt't work ...
I read in another forum to do a factory reset might help --- but it got a lot of installed apps etc and I am not willing to reinstall everything ...
Anyone an idea how to reactivate?
Thanks for help!

Xiaomi mi 9T Pro - Problems receiving calls while on 4G

Hello!
I hope someone can help me with this "little" problem that I'm experimenting with my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) I checked everything before buying and the phone is fully compatible with my carrier (I'm from Venezuela), however, I noticed that when the phone is on 4G it switches to 3G/H/H+ in order to make/receive calls (which is pretty normal since my carrier does not support VoLTE). The problem comes when there is an incoming call, it should switch automatically to 3G/H/H+ BUT it does not happen all the time, in fact, I can say that it only happens 25% of the time when I was testing, of course, when it does not happen there is no way to receive the incoming call.
So far I tried:
- Forcing the phone to stay on 3G (everything works great)
- Testing the different network options (it switches from 4G to 3G but not always as it should)
- Switching from SIM slot 1 to slot 2
- At the moment the preferred network type is LTE/TD-SCDMA/UMTS (default)
Could it be a software issue? or could it be related to my carrier? I haven't tried using a SIM card from another carrier.
After all, I bought a PHONE that does not behave like an actual phone all the time, so, I hope someone can help me with this.
Thanks in advance.
Thank you, I almost thought I was the only one.
I bought my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) a week ago and I have the same symptoms like you.
Im on A1 Network in Austria running default network settings and I realized after hours I couldn't make calls (and obviously did't receive any).
This is the first phone I had this network problems, and I am on A1 network for 20 years with different phones....
I hope someone can share some light why this happens and what are the best settings for European (Austrian) A1 network.
Trying to switch to LTE/UMTS, but that setting is always reset to the default above after reboot.
As its also my work phone it would be very bad not recognizing for hours that I'm not reachable...
Thank you !
A1 supports VoLTE, try to enable it on your phone, I have no issues running a dual SIM config with A1 and 3 .....
pietropizzi said:
Thank you, I almost thought I was the only one.
I bought my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) a week ago and I have the same symptoms like you.
Im on A1 Network in Austria running default network settings and I realized after hours I couldn't make calls (and obviously did't receive any).
This is the first phone I had this network problems, and I am on A1 network for 20 years with different phones....
I hope someone can share some light why this happens and what are the best settings for European (Austrian) A1 network.
Trying to switch to LTE/UMTS, but that setting is always reset to the default above after reboot.
As its also my work phone it would be very bad not recognizing for hours that I'm not reachable...
Thank you !
Click to expand...
Click to collapse
Hi! It feels better knowing that I'm not alone.
The fact is that I can actually make calls (it take from 3 to 5 seconds switching from 4G to 3G/H), the problem comes when there is an incoming call, sometimes it works (it switches to 3G/H and when the call is ended, it switches back to 4G) but most it does not. I just tried LTE/UMTS and it does work but not for long, I can see that it happens and sometimes it does not. I found a "solution" which involves forcing to 3G/H but it's not the point, there should be a real solution. At this moment, I haven't found a correct network configuration, all the ones that I've tried just have worked for me for some time, and then the problem is back without even rebooting the phone. Could it be caused by a faulty SIM or it's just a network/carrier issue? I don't want to think that it's a hardware issue.
error23 said:
A1 supports VoLTE, try to enable it on your phone, I have no issues running a dual SIM config with A1 and 3 .....
Click to expand...
Click to collapse
Whats your ROM Version ?
I alreaddy tried to enable VoLTE, I can switch it on and the VoLTE Symbol appears.
The problem is - I have no caller ID. I don't even see the phone number when someone calls me ("unbekannter Anrufer" - "unknown caller")
That's not conveniant, so as soon as I switched OFF VoLTE caller recognition was enabled again.
Is VoWIFI working at you with A1 ? I can enable it but I don't get the symbot at home in my WIFI network.
So for now I see two options:
- the correct (stable) network configuration for Austria that persist in the phone configuration
- enabling VoLTE but with a solution for a working caller ID
I finally got found the solution
Problem is the notification settings.
This was somehow reset after the update to mui 11.
To fix the issue:
1. Go to settings
2. Click notification
3. Click the notification badges (3rd icon)
4. Find the "phone" icon
5. Enable the show notification
6. Exit to settings and test
Having same problem
Can someone help me I am from Malta and have Xiaomi mi9t pro and from last night stopped receiving calls and incoming . Tried with sim 1 and it worked but it happened again . I tried the notification settings but still the same problem .
I had trouble not receiving calls also...
After looking here, and also on YouTube, I started going through my phone again. I too was not getting my calls a lot, but I have only had my phone maybe 2 weeks, so there's not much on it yet. One thing I am always adding is themes. The theme feature is it's own pre installed app as I'm sure we've all seen. Different one's have been doing/blocking certain features at times on my phone. My husband's calls were being sent to voicemail, and some other important calls. I noticed the other day when I tried a new theme it locked me out of my phone with no preface to get back to the lock screen. I had to take a picture and select send to get back to the lock screen. Remembering this, I decided to go back to the original developer theme for the phone. My phone now rings. Original developer mode also controls the call feature, not just the theme, which I did not know or read until now. Going back to it I believe kind of reset my configuration. I would say give this a try for sure. Hope it helps someone else I love my phone and didn't want to lose it. FYI, I am on TMobile network in the USA.
Hi!
I have a very similar problem on a xiaomi redmi note 8t. I tried various settings, but failed. This is annoying because the phone is relatively new. I think it is a hardware problem.
Saulor said:
Hello!
I hope someone can help me with this "little" problem that I'm experimenting with my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) I checked everything before buying and the phone is fully compatible with my carrier (I'm from Venezuela), however, I noticed that when the phone is on 4G it switches to 3G/H/H+ in order to make/receive calls (which is pretty normal since my carrier does not support VoLTE). The problem comes when there is an incoming call, it should switch automatically to 3G/H/H+ BUT it does not happen all the time, in fact, I can say that it only happens 25% of the time when I was testing, of course, when it does not happen there is no way to receive the incoming call.
So far I tried:
- Forcing the phone to stay on 3G (everything works great)
- Testing the different network options (it switches from 4G to 3G but not always as it should)
- Switching from SIM slot 1 to slot 2
- At the moment the preferred network type is LTE/TD-SCDMA/UMTS (default)
Could it be a software issue? or could it be related to my carrier? I haven't tried using a SIM card from another carrier.
After all, I bought a PHONE that does not behave like an actual phone all the time, so, I hope someone can help me with this.
Thanks in advance.
Click to expand...
Click to collapse
I have the same issue here in same phone but on EU MIUI 12.0.3.0 .. with the same symptoms u described .. i suspected in sim card and i replaced it with a new one and the issue still there .. did u find a solution for this issue?
I'm not sure if this is the same issue as what's described by OP, but it's somewhat similar (not receiving calls). Sometimes my colleagues will call me on Whatsapp and state that they're unable to reach me via the cellular network. This is what fixed it for me:
Settings - SIM cards & mobile networks - Select your sim card - turn off 'use volte (use volte to improve the quality of voice calls)'
scarmage said:
I'm not sure if this is the same issue as what's described by OP, but it's somewhat similar (not receiving calls). Sometimes my colleagues will call me on Whatsapp and state that they're unable to reach me via the cellular network. This is what fixed it for me:
Settings - SIM cards & mobile networks - Select your sim card - turn off 'use volte (use volte to improve the quality of voice calls)'
Click to expand...
Click to collapse
I tried this option and also not working the issue still there since 10 daysi also tried
Settings all specs then internal storage then sim 1 then change the setting to gsm only
After that the line working for 10 min and then again i can't receive calls or make ones
I have the same problem i have a redmi note 9 pro, i can't receive calls in 4G, i only can receive calls in Edge someone could resolve this? I tried all of these methods but nothing works

Wifi calling

Hello,
I recently read about the possibility of using WiFi calling in India and initially it will be available for k20 pro users. Can anyone help how to enable this feature in K20 pro.
Link to the report on WiFi calling feature : https://www.indiatoday.in/technolog...-work-on-your-phone-or-not-1626991-2019-12-10
Anand_theGeek said:
Hello,
I recently read about the possibility of using WiFi calling in India and initially it will be available for k20 pro users. Can anyone help how to enable this feature in K20 pro.
Link to the report on WiFi calling feature : https://www.indiatoday.in/technolog...-work-on-your-phone-or-not-1626991-2019-12-10
Click to expand...
Click to collapse
Step 1 Go to your dialer and type in
*#*#4636#*#*
Scroll down until you see WiFi calling provisioned if you can't toggle to on proceed to step 2
Step 2 Return to the dialer and type in
*#*#869434#*#*
You will get a message flash up on the bottom of your screen
Enter these codes into the Dialer to enable the options in Settings. (Settings < SIM Cards & mobile networks < Sim Card Settings < VoLTE Enabled/Make Calls using WLAN)
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*

Question Not seeing Network Preference under Enable Wifi Calling Tmobile USA

Hello
I just got this phone and set it up. Its a Global version 13.0.4 SKDMIXM.
I am on TMoblie USA - the phone is working great on LTE and 5G .
I am not able to see the Network preference under wifi calling where is can select Prefered Wifi Calling.
It appears that its running on default Prefered Cellular - because I can only see the VoLTE symbol on top.
Can someone help me in fixing this configuration to select Prefered Wifi Calling ? TIA
rogerga said:
Hello
I just got this phone and set it up. Its a Global version 13.0.4 SKDMIXM.
I am on TMoblie USA - the phone is working great on LTE and 5G .
I am not able to see the Network preference under wifi calling where is can select Prefered Wifi Calling.
It appears that its running on default Prefered Cellular - because I can only see the VoLTE symbol on top.
Can someone help me in fixing this configuration to select Prefered Wifi Calling ? TIA
Click to expand...
Click to collapse
Hello, I'm using a 11T Pro Dual SIM India model with India SIM in Slot 1 and TMO SIM in Slot 2.
I have not found the specific setting to make Wifi Calling "Preferred" but, my phone does indicate Vo WiFi even when I have Wifi connected and Mobile Data turned on too once Wifi Calling is enabled as below.
Apparently the Voice Over WiFi Settings (at least here on my phone) only show up for SIM 1, does not show for SIM 2.
Attached are sample screenshots where the Settings are under SIM 1.
Steps to get there-
Settings > SIM cards & mobile networks > Click on SIM 1
All the way down, last Setting is "Wi-Fi Calls" to enable "Make calls using Wi-Fi".
Hope this helps.
graphreak said:
Hello, I'm using a 11T Pro Dual SIM India model with India SIM in Slot 1 and TMO SIM in Slot 2.
I have not found the specific setting to make Wifi Calling "Preferred" but, my phone does indicate Vo WiFi even when I have Wifi connected and Mobile Data turned on too once Wifi Calling is enabled as below.
Apparently the Voice Over WiFi Settings (at least here on my phone) only show up for SIM 1, does not show for SIM 2.
Attached are sample screenshots where the Settings are under SIM 1.
Steps to get there-
Settings > SIM cards & mobile networks > Click on SIM 1
All the way down, last Setting is "Wi-Fi Calls" to enable "Make calls using Wi-Fi".
Hope this helps.
Click to expand...
Click to collapse
Thanks - I saw a post that had this diagram - In my case it has defaulted to
prefered cellular - so i dont get VoWifi
rogerga said:
Hello
I just got this phone and set it up. Its a Global version 13.0.4 SKDMIXM.
I am on TMoblie USA - the phone is working great on LTE and 5G .
I am not able to see the Network preference under wifi calling where is can select Prefered Wifi Calling.
It appears that its running on default Prefered Cellular - because I can only see the VoLTE symbol on top.
Can someone help me in fixing this configuration to select Prefered Wifi Calling ? TIA
Click to expand...
Click to collapse
Operators can disable this menu if they want to lock you onto Wifi preferred or cellular preferred. Does this only happen with this phone or does it also happen with the SIM in another Android phone?
rogerga said:
Thanks - I saw a post that had this diagram - In my case it has defaulted to
prefered cellular - so i dont get VoWifi
View attachment 5657751
Click to expand...
Click to collapse
There's a possibility of TMO-US not supporting WiFi calling on the Xiaomi 11T (Global), perhaps.
Although, I have been using various Unlocked phones (Nokia & Samsung) on TMO-US for the past few years & have practically never had issues with WiFi calling on any. Shall have to test it once I'm back. Won't be for some time.
Is your phone on the latest firmware? Try updating it to check if there's a new update available
which hopefully can solve your issue.
Couple of options to test, in case you have not already tested them-
a) leave WiFi Calling Enabled then disable the VoLTE feature and check if WiFi calling works?
b) disable Mobile Data, WiFi Calling enabled with WiFi connected and check if WiFi Calling works.
c) some users have had to ensure their E911 address is correctly in place on the TMO account too.
mici01 said:
Operators can disable this menu if they want to lock you onto Wifi preferred or cellular preferred. Does this only happen with this phone or does it also happen with the SIM in another Android phone?
Click to expand...
Click to collapse
I move from a One Plus 6 - it had the options
graphreak said:
There's a possibility of TMO-US not supporting WiFi calling on the Xiaomi 11T (Global), perhaps.
Although, I have been using various Unlocked phones (Nokia & Samsung) on TMO-US for the past few years & have practically never had issues with WiFi calling on any. Shall have to test it once I'm back. Won't be for some time.
Is your phone on the latest firmware? Try updating it to check if there's a new update available
which hopefully can solve your issue.
Couple of options to test, in case you have not already tested them-
a) leave WiFi Calling Enabled then disable the VoLTE feature and check if WiFi calling works?
b) disable Mobile Data, WiFi Calling enabled with WiFi connected and check if WiFi Calling works.
c) some users have had to ensure their E911 address is correctly in place on the TMO account too.
Click to expand...
Click to collapse
I had a working One Plus 6 - so I know TMO has VoWifi - I use it a lot due to poor reception at home .
The current workaround to force VoWIFI is
Turn On Airplane MOde
Turn ON WiFi only
then it works in VOWIFI with out any issues
I know I am missing a menu Item that can toggle this setting . I would prefer having that setting but its not a breaker for now . The phone works with all the Network features of TMO , LTE , 4G , 5G etc . No visual voicemail thats all.
Thanks
rogerga said:
I had a working One Plus 6 - so I know TMO has VoWifi - I use it a lot due to poor reception at home .
The current workaround to force VoWIFI is
Turn On Airplane MOde
Turn ON WiFi only
then it works in VOWIFI with out any issues
I know I am missing a menu Item that can toggle this setting . I would prefer having that setting but its not a breaker for now . The phone works with all the Network features of TMO , LTE , 4G , 5G etc . No visual voicemail thats all.
Thanks
Click to expand...
Click to collapse
Perhaps you might want to give this a try-
Phone Dialer- *#*#86943#*#* VoWiFi carrier check disable
From here- https://forum.xda-developers.com/t/wifi-calling-volte-on-mi-9.3917887/
(or here too https://www.hardreset.info/devices/xiaomi/xiaomi-mi-11/codes/)
graphreak said:
Perhaps you might want to give this a try-
Phone Dialer- *#*#86943#*#* VoWiFi carrier check disable
From here- https://forum.xda-developers.com/t/wifi-calling-volte-on-mi-9.3917887/
(or here too https://www.hardreset.info/devices/xiaomi/xiaomi-mi-11/codes/)
Click to expand...
Click to collapse
Thanks - this code is what got me to where I am now . I think from other articles - the mbn config may require some tweaking - but it refuses to give me access to it when i use *#*#663368378#*#*
Same access issue here too.
Wish you luck.
Pinging to see if there is a soln. in future.

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