Database Develop

wifi calling

I got a n950U1 unlocked note 8 ( not rooted) which is a snapdragon version. I am not living in the states but bought my mobile in my holidays and was wondering how to get wifi calling on this phone. My carrier has it available as i was using it on my previous mobile, and can still use if i use my sim in iphone. I heard that the t-mobile version has it but how can i activate the setting or get an apk which can enable this setting for me? Is the app completely missing or any secret setting needs to be enabled?
Or is there a different way to enable this feature? I know that the N950F version has it but why not this one? I wasn't aware that there are differences in such options.

Also unlocked N950U1 is able to use wifi calling.
If not yet upgraded to Oreo, you can enable Wifi calling in IMS settings, using Shortcut Master app. (Search this forum for thread)
Setting will then be in Phone/Calling app, not in the general phone Settings.
After Oreo I no longer can access the IMS settings, but luckily Wifi calling remained enable after FW upgrade.

I have tried to enable via shortcut master but the app itself to make wifi calling seems to be missing. There is no setting to enable in IMS settings

MiLoKa said:
I got a n950U1 unlocked note 8 ( not rooted) which is a snapdragon version. I am not living in the states but bought my mobile in my holidays and was wondering how to get wifi calling on this phone. My carrier has it available as i was using it on my previous mobile, and can still use if i use my sim in iphone. I heard that the t-mobile version has it but how can i activate the setting or get an apk which can enable this setting for me? Is the app completely missing or any secret setting needs to be enabled?
Or is there a different way to enable this feature? I know that the N950F version has it but why not this one? I wasn't aware that there are differences in such options.
Click to expand...
Click to collapse
I also have SM-N950U1 and I have NEVER seen or found the WiFi calling in this device, regardless of version Nouget or Oreo. I have read also a few months ago that using Shortcut maker it "should" be able to work but I also have had no success with this. You are able to find bits and pieces of WiFi calling but no actual app for it to work.

As I stated, the setting is in the Phone / calling app. In Shortcut Manager look for "WfcPref".

Not really a solution but more of a bandaid , maybe resort to flashing the t mobile firmware if all avenues have been exhausted?
Sent from my SM-N950U using Tapatalk

OnnoJ said:
As I stated, the setting is in the Phone / calling app. In Shortcut Manager look for "WfcPref".
Click to expand...
Click to collapse
I also have checked that option but there is no actual app launching, it is all tutorials or help files. I suppose it is not included within the firmware. Or maybe it is because i haven't initialize it with a t-mobile sim card. I was just hoping that maybe there is some sort of apk app by which we can have it.
This is all i get in shortcut master

Just to add also the phone/ calling app screenshot and the connections/ more connections screen

Here is what i noticed.
Note: I'm on note8 exynos csc xme
I use dual sim.
Sim1 do not support wifi calling
Sim2 supports wifi calling
I have wifi calling setting to switch it on only when i switch everything to sim2, data messages and calls.
Sent from my SM-N950F using Tapatalk

vash_h said:
Here is what i noticed.
Note: I'm on note8 exynos csc xme
I use dual sim.
Sim1 do not support wifi calling
Sim2 supports wifi calling
I have wifi calling setting to switch it on only when i switch everything to sim2, data messages and calls.
Sent from my SM-N950F using Tapatalk
Click to expand...
Click to collapse
Odd upload fail..View attachment 4467264View attachment 4467266
Sent from my SM-N950F using Tapatalk

Unfortunately my phone is not dual sim but i am wondering if rooting the phone would help me to be able to have wifi calling?
Is there any way to fix this by rooting the phone?

MiLoKa said:
Unfortunately my phone is not dual sim but i am wondering if rooting the phone would help me to be able to have wifi calling?
Is there any way to fix this by rooting the phone?
Click to expand...
Click to collapse
It's restricted by 2 factors. Your telco and csc.
Obviously to have wifi calling ur mobile operator must support this and allow ur phone number to use this function.
Second is the csc of your phone. Some branded phone restrict this, they do it via csc code. U can look around on this forum there is ppl that manage to decrypt the csc files edit it and load it back. Root required for this.
Sent from my SM-N950F using Tapatalk

vash_h said:
It's restricted by 2 factors. Your telco and csc.
Obviously to have wifi calling ur mobile operator must support this and allow ur phone number to use this function.
Second is the csc of your phone. Some branded phone restrict this, they do it via csc code. U can look around on this forum there is ppl that manage to decrypt the csc files edit it and load it back. Root required for this.
Click to expand...
Click to collapse
Hi again,
My telco has it as i was using on my iphone. The problem is with the note 8, There is no functional app or apk for this when i do a search on shortcut master. After rooting will i be able to get the wifi calling app from somewhere after editing the csc?
Or is it much easier if i change the firmware with tmobile branded and then use my phone with it. Do you think i will get the app then by editing the csc file?
Or will it still not work as it is t mobile branded.
This is so annoying, it should have been much easier and with much more freedom, why is this wifi calling even missing as app, they already can disable if the telco doesnt support it. I never had such issue before

With Note 8 N950U1 you should have wifi calling without any problems.
Check with T-Mobile site how it works and what to do, i.c. check the requirements.. Did you put in 911 address?

vash_h said:
Here is what i noticed.
Note: I'm on note8 exynos csc xme
I use dual sim.
Sim1 do not support wifi calling
Sim2 supports wifi calling
I have wifi calling setting to switch it on only when i switch everything to sim2, data messages and calls.
Sent from my SM-N950F using Tapatalk
Click to expand...
Click to collapse
Hi vash
My wifi calling is working well on sim 1 until I change this sim card to slot 2, then changed call/text and data to SIM 2,
(because I inserted SD card with 2 sim cards now, my another sim card was issued by another country, cannot get new one, so I cut the SIM 1 and moved to SIM 2)
Then wifi calling disappeared, it's gone..
Looks wifi calling will be working on SIM 1 only.
---------- Post added at 23:54 ---------- Previous post was at 23:43 ----------
I'm sorry.
WiFi calling is working for SIM 2 as well.
Depends on the WiFi internet connection quality.

hinnn said:
Hi vash
My wifi calling is working well on sim 1 until I change this sim card to slot 2, then changed call/text and data to SIM 2,
(because I inserted SD card with 2 sim cards now, my another sim card was issued by another country, cannot get new one, so I cut the SIM 1 and moved to SIM 2)
Then wifi calling disappeared, it's gone..
Looks wifi calling will be working on SIM 1 only.
---------- Post added at 23:54 ---------- Previous post was at 23:43 ----------
I'm sorry.
WiFi calling is working for SIM 2 as well.
Depends on the WiFi internet connection quality.
Click to expand...
Click to collapse
yup.. wanted to ask you to check internet connection quality. if the connection is not good wifi calling doesnt work. most of the time when i am overseas, hotel wifi is not good enough for wifi calling.. thus kind of useless for me.

vash_h said:
yup.. wanted to ask you to check internet connection quality. if the connection is not good wifi calling doesnt work. most of the time when i am overseas, hotel wifi is not good enough for wifi calling.. thus kind of useless for me.
Click to expand...
Click to collapse
Yes, thanks.
But probably not only internet quality, I think carrier will check some certificate or something.
Because no WiFi calling icon when I'm using the employee WiFi in office, I logon with my user name and password, and sometimes public WiFi is also not working for WiFi calling,

On the main screen click on bottom left call icon to make a call. Then go to setting on top right 3 dots down. You will see wifi calling enable or disabled. You can turn on or off. If it can help someone. I was looking everywhere and it didnt help, but eventually found it. It's not in connection and more setting like some place stated.

WiFi Calling Issues

Hey guys, so just curious, is there a way to force WiFi calling? My signal sucks in my house but my WiFi is awesome. Supposedly the device will prefer mobile signal if it is strong enough, but you can't physically choose WiFi calling to be default.
If anyone knows anything, let me know. I'm on EE.

when at home if you want wifi calling to kick in instead of celluar, do the following but it is a pain to remember to do it each time
Turn on Airplane mode
Turn on Wifi
Turn on Bluetooth (if you use bluetooth)
when you leave house, just turn off airplane mode

You can set it to prefer WiFi instead of mobile network, I don't know if it really works, my p20 pro is choosing WiFi always, even if both of signals are 100%

hexen88 said:
You can set it to prefer WiFi instead of mobile network, I don't know if it really works, my p20 pro is choosing WiFi always, even if both of signals are 100%
Click to expand...
Click to collapse
No option for prefer WiFi on the P20 Pro CLT-L29 8.1.0.131(C782) or if there is, I can't find it as only have option for wifi enabled calling on/off

walkerx said:
No option for prefer WiFi on the P20 Pro CLT-L29 8.1.0.131(C782) or if there is, I can't find it as only have option for wifi enabled calling on/off
Click to expand...
Click to collapse
Annoying thing is before you put the sim card for the first time the option was there for WiFi calling and volte

sunmaid said:
Annoying thing is before you put the sim card for the first time the option was there for WiFi calling and volte
Click to expand...
Click to collapse
have wifi calling enabled, but if I don't want it to keep switching to cellular while at home, i have to switch to airplane mode, then re-enable both wifi and bluetooth. it then works, but have to remember to keep switching
you may not see wifi calling in the notification area, but when you make a call you will get the wifi notice showing

walkerx said:
have wifi calling enabled, but if I don't want it to keep switching to cellular while at home, i have to switch to airplane mode, then re-enable both wifi and bluetooth. it then works, but have to remember to keep switching
you may not see wifi calling in the notification area, but when you make a call you will get the wifi notice showing
Click to expand...
Click to collapse
It's not working ... Tried aeroplane mode with WiFi on and Bluetooth on but won't make or receive calls ..

sunmaid said:
It's not working ... Tried aeroplane mode with WiFi on and Bluetooth on but won't make or receive calls ..
Click to expand...
Click to collapse
does it say wifi calling?
Has your provider allowed wifi calling on the device?
Also make sure you have enabled the option in the network settings and check under the default dialer wifi calling is enabled

walkerx said:
does it say wifi calling?
Has your provider allowed wifi calling on the device?
Also make sure you have enabled the option in the network settings and check under the default dialer wifi calling is enabled
Click to expand...
Click to collapse
There is no settings in UK 782 firmware it's meant to be enabled by default I believe

sunmaid said:
There is no settings in UK 782 firmware it's meant to be enabled by default I believe
Click to expand...
Click to collapse
Goto Settings
Goto Wireless & networks
Goto Call settings
Under Sim 1 there is a setting called Wi-Fi calling and it should say enabled, if not choose it then enable feature
You can also get to this from the default dialler by choosing settings
Under Sim 1 there is a setting called Wi-Fi calling and it should say enabled, if not choose it then enable feature

walkerx said:
Goto Settings
Goto Wireless & networks
Goto Call settings
Under Sim 1 there is a setting called Wi-Fi calling and it should say enabled, if not choose it then enable feature
You can also get to this from the default dialler by choosing settings
Under Sim 1 there is a setting called Wi-Fi calling and it should say enabled, if not choose it then enable feature
Click to expand...
Click to collapse
There is no settings in 782 UK phone for WiFi calling / volte

sunmaid said:
There is no settings in 782 UK phone for WiFi calling / volte
Click to expand...
Click to collapse
Who is your network provider as the options are there on my CLT-L29 8.1.0.131 (C782) and I'm with Three UK

walkerx said:
Who is your network provider as the options are there on my CLT-L29 8.1.0.131 (C782) and I'm with Three UK
Click to expand...
Click to collapse
1st sim used was 3 after that no options but was there before. Now use 02 sim

sunmaid said:
1st sim used was 3 after that no options but was there before. Now use 02 sim
Click to expand...
Click to collapse
I think that's your problem, O2 do not support wifi calling on the device, both Three UK and EE do, not sure about VF either

walkerx said:
I think that's your problem, O2 do not support wifi calling on the device, both Three UK and EE do, not sure about VF either
Click to expand...
Click to collapse
When I put a 3 sim in the there is no options for WiFi calling.. never has been since input the first SIM card in which was 3 ..

sunmaid said:
When I put a 3 sim in the there is no options for WiFi calling.. never has been since input the first SIM card in which was 3 ..
Click to expand...
Click to collapse
did your phone rebrand and get the 3 logo on bootup? if not it never rebranded and reason why possibly never got the option

walkerx said:
did your phone rebrand and get the 3 logo on bootup? if not it never rebranded and reason why possibly never got the option
Click to expand...
Click to collapse
Yes got the 3 reband

sunmaid said:
Yes got the 3 reband
Click to expand...
Click to collapse
do you still have the 3 sim? if not are you able to get one for testing?
I've attached screenshot showing the wifi calling option on the phone with Three sim installed

Call carrier support / Check firewall
I had to call vodafone. After some time they decided to disable wifi calling feature for my account for a couple of minutes and re-enabled it. That worked for me. My phone instantly logged into wifi calling again.
Also make sure that outbound connections to port 500/4500 are not being blocked by any firewall/router.

How do you set Wifi to be preferred instead of cellular?

When I'm on WiFi, I can't receive calls

Hello, I've only just finally figured out that while my unlocked pixel 4 xl connected to wifi, i cant receive calls, I can receive while i am using the phone with WIFI, but once i leave the phone go to sleep and connected to wifi, then my phone can not receive the calls and unreachable.
I have tried to change the network mode to 3G while i am connected to wifi, and it seems solved the issue.
While i am not connected to wifi (LTE) i have no issues at all.
I have unlocked Pixel 4 XL with Jan update (latest build) rooted through Madisk, stock kernals and everything
is there any solution to this? I've searched through forums and this subreddit but have yet to find an answer. Any help would be appreciated.

Maybe try turning off wifi calling if it's enabled?
Sent from my Pixel 4 XL using Tapatalk

Adnansaeedhamed said:
Hello, I've only just finally figured out that while my unlocked pixel 4 xl connected to wifi, i cant receive calls, I can receive while i am using the phone with WIFI, but once i leave the phone go to sleep and connected to wifi, then my phone can not receive the calls and unreachable.
I have tried to change the network mode to 3G while i am connected to wifi, and it seems solved the issue.
While i am not connected to wifi (LTE) i have no issues at all.
I have unlocked Pixel 4 XL with Jan update (latest build) rooted through Madisk, stock kernals and everything
is there any solution to this? I've searched through forums and this subreddit but have yet to find an answer. Any help would be appreciated.
Click to expand...
Click to collapse
Sounds like your phone is trying to make a call over Wi-Fi but your carrier (or SIM) may not support Wi-Fi calling. Where are you located and which carrier? Using the dialer, use the following code to check your provisioned status: *#*#4636#*#* If Wi-Fi calling is toggled OFF and you cannot change the setting (grayed our) then it will not work. Ask your carrier directly if they support it.

I have tested more to find out where the issue is happening, i connected to other wifis , and the issue was not reported, the issue the only in my apartment, and only when i am connected to lte, on 3g no issue, and once i leave my apartment, i can receive calls on lte normal, this strange, i was having the original pixel with no issues such, and my wife having iPhone and doesn't have this issue,i have tried her sim card (from the same provider) and the same issue
Now when i go home, i have to switch the network mode to 3g to be able to receive calls, otherwise it will show out of coverage.
I spoke with network provider, and they told this issue we with the phone, and its ture, since inwas using the same network in my original pixel, and the issue was never happened
Please help to advise.
Thanks

Adnansaeedhamed said:
I have tested more to find out where the issue is happening, i connected to other wifis , and the issue was not reported, the issue the only in my apartment, and only when i am connected to lte, on 3g no issue, and once i leave my apartment, i can receive calls on lte normal, this strange, i was having the original pixel with no issues such, and my wife having iPhone and doesn't have this issue,i have tried her sim card (from the same provider) and the same issue
Now when i go home, i have to switch the network mode to 3g to be able to receive calls, otherwise it will show out of coverage.
I spoke with network provider, and they told this issue we with the phone, and its ture, since inwas using the same network in my original pixel, and the issue was never happened
Please help to advise.
Thanks
Click to expand...
Click to collapse
Turn off wifi calling on your phone. I had a similar problem with my unlocked pixel 4xl on Verizon and that solved the problem

I don't have wifi calling option enabled under mobile settings, my operator doesn't support wifi calling.

Adnansaeedhamed said:
I don't have wifi calling option enabled under mobile settings, my operator doesn't support wifi calling.
Click to expand...
Click to collapse
What is the provisioning status of Wi-Fi calling in the phone diagnostic menu ( *#*#4636#*#* ). Is the toggle on or off? Is it grayed out?

Its grayed out and toggled off

Adnansaeedhamed said:
Its grayed out and toggled off
Click to expand...
Click to collapse
What country do you live in, and which carrier do you use?
I would do a network reset in settings under the reset menu. If that doesn't work, backup and do a FDR from recovery.

v12xke said:
What is the provisioning status of Wi-Fi calling in the phone diagnostic menu ( *#*#4636#*#* ). Is the toggle on or off? Is it grayed out?
Click to expand...
Click to collapse
In my case, it's on and greyed out.
I am using unlocked Xiaomi Mi A2 running on RROS v8.5.6.

Question WIFI calling

HI all,
As noted in the product pages and other information about the 5a, its being sold directly via Google. Has anyone ever figured out how to add WIFI calling to these devices?
I am under the impression if you want wifi calling on a certain network you MUST purchase a phone from that network (IE pixels, Samsungs etc).

I didn't really think about it. It "just works" for me on Mint, an MVNO on T-Mobile. I did use the USB-cable based method to migrate settings from the old phone to the pixel 5a before moving my SIM. But I don't think that was needed.
I was already using it w/ a previous phone, having gone to the Mint website to get the feature provisioned for my subscription. That phone was a retail phone I bought direct from Motorola, also not connected to Mint nor T-Mobile in any way. Originally, Once I provisioned it at Mint, the WiFi-Calling settings became available under Network settings in the phone.

Wifi Calling is working fine on Verizon.

Worked on AT&T pretty smoothly. Flipped the Wi-Fi calling switch under settings. Agreed to some at&t custom pages about 911, and 10 seconds later was calling on wifi.

Haven't been able to enable wifi calling with AT&T. Getting error EDS0060.

My T-Mobile US is working with wifi and 5g, no problems. I bought from Google to avoid crapware and locks from TMO.

I looked for the Wifi switch under settings and had none. It was the same with my Pixel 3a as well, and I am using Cricket. Signal at work sux so wfi calling would be good. I'm not there very often.
Still would be nice to have.

reidcc said:
I looked for the Wifi switch under settings and had none. It was the same with my Pixel 3a as well, and I am using Cricket. Signal at work sux so wfi calling would be good. I'm not there very often.
Still would be nice to have.
Click to expand...
Click to collapse
They hide it well - they don't want people to turn it off as it saves them a lot of bandwidth if everyone connects through their own wifi instead of a cell tower. Go to Settings/Network & internet/ then hold down Mobile Network for a bit, then go to bottom and select Advanced and look towards the bottom for Wifi Calling.

CarinaPDX said:
They hide it well - they don't want people to turn it off as it saves them a lot of bandwidth if everyone connects through their own wifi instead of a cell tower. Go to Settings/Network & internet/ then hold down Mobile Network for a bit, then go to bottom and select Advanced and look towards the bottom for Wifi Calling.
Click to expand...
Click to collapse
Thank You! I didn't realize you needed to hold the Mobile networks for a bit. Last time I just tapped it, went to advanced and nada. This time I found the switch and started activating wifi calling but errored out. I'll ty again later.

reidcc said:
Thank You! I didn't realize you needed to hold the Mobile networks for a bit. Last time I just tapped it, went to advanced and nada. This time I found the switch and started activating wifi calling but errored out. I'll ty again later.
Click to expand...
Click to collapse
I don't think I can help further. Cricket is AT&T and does support wifi calling; the Pixel should be able to support their version. OTOH it may not be supported with your SIM card - if it is old you may want to see if you can get a new SIM card - just one possibility. There is a reason that wifi calling was not "on" by default. Edit: I assume your 5a came direct from Google, as mine did. Phones sold by network operators do have some modifications.

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.