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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
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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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
Hi, I had Poco F1 before with working VoLTE, so I know that my carrier and current Sim card is supporting it. All I had to do on the F1 was typing in that code *#*#86583#*#* and activating the new volte setting.
I tried that with the X3 but it's not working. Whenever I receive/make a phone call my connection will switch from 4G to 3G.
Is there a workaround or is it a hardware limitation? I could imagine because the X3 just has an entry level SOC that the modem has some artificial restrictions to differentiate from the flagship SOC (845/865).
Did you get a volte carrier check disabled message after dialling that?
For me both volte and vowifi are working fine
Yes I got that. Are you telling the phone your real location or do I have to chose India or china? I remember with my Poco F1 I had to chose India to get features like call recording...btw I'm in Australia.
Changing regions
Anyone know if I do a factory reset and change to a different region like Europe will that make the phone operate on different Verizon bands possibly allowing me to get service? Just a thought ?
ankerede said:
Yes I got that. Are you telling the phone your real location or do I have to chose India or china? I remember with my Poco F1 I had to chose India to get features like call recording...btw I'm in Australia.
Click to expand...
Click to collapse
If you got the VoLTE was disabled message after entering the code, go to SIM settings and there will show the option to activate VoLTE. If not appears, try to enter the code again and check the SIM settings.
---------- Post added at 05:38 AM ---------- Previous post was at 05:30 AM ----------
Glock45 said:
Anyone know if I do a factory reset and change to a different region like Europe will that make the phone operate on different Verizon bands possibly allowing me to get service? Just a thought ?
Click to expand...
Click to collapse
I think using different bands it's more about regional ROMs construction (Global, India, Europe etc) than changing region in ROM settings. Alternative, you can flash a different regional ROM using MiFlash and see if it helps with your problem.
After entering that code I get the switch, to turn on volte, but that doesn't change anything.
ankerede said:
After entering that code I get the switch, to turn on volte, but that doesn't change anything.
Click to expand...
Click to collapse
Can't you see the specific VoLTE symbol near mobile signal in the upper right corner of the screen? If you can't see it, you can try to make a phone call and see if the google dialer shows it's a VoLTE call (or check the dialer history calls if you use Xiaomi dialer....you'll see there if it was a VoLTE call or not).
Same here with my Poco x3 NFC global I am on Vodafone UK my carrier support volte and vofi but I can't enable it , I have no settings . What I found when I flash custom ROMs the volte works , the sound in voice calls is super crisp and I got the icon always there vote on sim and vofi on WiFi . I need an option or a menu or a trick to show that option in stock ROM to enable it .
I remember back in the days when I had OnePlus I had to go in the ingineer menu to tick on a toggle " enable volte" and "enable vofi"
And later on the OnePlus 7t pro I had to install an apk to force that toggle so I can enable it .
On my Mi Mix 2s it shows volte when enabled. This one no. Poco needs to fix this before a number of users get dumped for lack of volte.
Aburel18 said:
Same here with my Poco x3 NFC global I am on Vodafone UK my carrier support volte and vofi but I can't enable it , I have no settings . What I found when I flash custom ROMs the volte works , the sound in voice calls is super crisp and I got the icon always there vote on sim and vofi on WiFi . I need an option or a menu or a trick to show that option in stock ROM to enable it .
I remember back in the days when I had OnePlus I had to go in the ingineer menu to tick on a toggle " enable volte" and "enable vofi"
And later on the OnePlus 7t pro I had to install an apk to force that toggle so I can enable it .
Click to expand...
Click to collapse
Did you try activate it using this codes in Dialer? VoLTE: *#*#86583#*#* and VoWIFI: *#*#869434#*#*. After that go to your SIM settings and you'll get the option to activate VoLTE and VoWiFi.
I have tried those and I left it on enabled both of them . Still not working
Alin45 said:
If you got the VoLTE was disabled message after entering the code, go to SIM settings and there will show the option to activate VoLTE. If not appears, try to enter the code again and check the SIM settings.
---------- Post added at 05:38 AM ---------- Previous post was at 05:30 AM ----------
I think using different bands it's more about regional ROMs construction (Global, India, Europe etc) than changing region in ROM settings. Alternative, you can flash a different regional ROM using MiFlash and see if it helps with your problem.
Click to expand...
Click to collapse
Thanks only problem is w/o being able to get cell service I can't unlock, any way to flash different rom not being unlocked?
Glock45 said:
Thanks only problem is w/o being able to get cell service I can't unlock, any way to flash different rom not being unlocked?
Click to expand...
Click to collapse
If you have an locked bootloader I'm not aware about a method to flash another regional ROM. I had read that many Poco X3 users have problems getting mobile data connection with Verizon (especially in USA).
Hello anyone has managed to operate the volte on both sim cards simultaneously on his POCO X3? thank you
Alin45 said:
If you have an locked bootloader I'm not aware about a method to flash another regional ROM. I had read that many Poco X3 users have problems getting mobile data connection with Verizon (especially in USA).
Click to expand...
Click to collapse
I was able to get 4g working good signal 4-5 bars long enough to link it to my MI account try to unlock it this Sunday is weird though the signal will stay strong then disconnect then come back and can't add it into any networks via their web site after I unlock it I'll take it to the diff stores try get them to activate it I'll let ya know how it turns out ?
I have the same problem with bouygue telecom, Volte is activated but doesn't work.
Volte also doesnt Work in Germany for reseller Sim cards of German Telekom and Telefonica ...
Alin45 said:
If you have an locked bootloader I'm not aware about a method to flash another regional ROM. I had read that many Poco X3 users have problems getting mobile data connection with Verizon (especially in USA).
Click to expand...
Click to collapse
Got my bootloader unlocked I'll try flash another regional rom
Same here in Italy, no volte, it switch ti 3g. With my previous 8t all was fine
I am using the stock room and used the dial codes got the settings but everytime I tried to make a call it wouldn't work I went to setting all specs and tap internal storage 5 times then choose the sim you are using then you have to turn the top switch off then back on. This is how I got mine working I also have extended my storage by using root explorer and cut everything under sd card and move to storage.
I have the european variant LM-V500EM of LG V50 which I was under the impression had a wifi calling / vowifi option. I've used the quickshortcut maker app and can see the option is there in the backend of the settings com.android.settings.Settings$Wifi CallingSettingsActivity. I can even open it and toggle it to on but it doesn't appear to do anything and still won't show in the regular call settings.
I've spoken to a number of UK networks who say it should work and spoken to LG directly who say wifi calling is unavailable for this variant/model and only the EE variant has WIFI calling. It's pretty frustrating that a function which the phone clearly is capable of is unusable.
Has anyone got any workarounds for this as I'm tearing my hair out here and don't want to have to sell the phone as apart from this it's great.
Thanks
I've been in engineering mode *#546368#*500# and SVC Menu / VoWIFI / W-Fi Toggle to ON but wifi calling still doesn't appear in the main settings.
Can this be enabled OTA by the right network carrier eg. EE , 3 etc ?
I've got the same phone, same problem.
Running Android 11, Smarty network
timosui said:
I have the european variant LM-V500EM of LG V50 which I was under the impression had a wifi calling / vowifi option. I've used the quickshortcut maker app and can see the option is there in the backend of the settings com.android.settings.Settings$Wifi CallingSettingsActivity. I can even open it and toggle it to on but it doesn't appear to do anything and still won't show in the regular call settings.
I've spoken to a number of UK networks who say it should work and spoken to LG directly who say wifi calling is unavailable for this variant/model and only the EE variant has WIFI calling. It's pretty frustrating that a function which the phone clearly is capable of is unusable.
Has anyone got any workarounds for this as I'm tearing my hair out here and don't want to have to sell the phone as apart from this it's great.
Thanks
Click to expand...
Click to collapse
Hi,
What is EE variant? I never seen it before and I can't find it in net.
I know only those variants:
V450PM
V450VM
V500EM
V500N
Greetings everyone!
Just got my Pixel 6a, love it so far, but i have one problem: Wifi Call doesnt work.
Whenever i try do a wifi call, i just get the message "out of network call"
Im using a german sim card from o2 (telefonica) and the thing is: my prior phone
was a redmi note 10 5g and with this phone (same sim card) wifi calling just worked like a charm.
so my question is: is there any trick to make it work? any explanation why it doesnt work with the 6a?
its a real bummer to go from a cheap a... redmi where this function just works fine to a nice and not so cheap pixel
(love google phones by the way, its my 3rd one), just to realize that something doesnt work as excpected.
i also tried a different os (calyx os), still no wifi-call.
help?
realCyphox said:
Greetings everyone!
Just got my Pixel 6a, love it so far, but i have one problem: Wifi Call doesnt work.
Whenever i try do a wifi call, i just get the message "out of network call"
Im using a german sim card from o2 (telefonica) and the thing is: my prior phone
was a redmi note 10 5g and with this phone (same sim card) wifi calling just worked like a charm.
so my question is: is there any trick to make it work? any explanation why it doesnt work with the 6a?
its a real bummer to go from a cheap a... redmi where this function just works fine to a nice and not so cheap pixel
(love google phones by the way, its my 3rd one), just to realize that something doesnt work as excpected.
i also tried a different os (calyx os), still no wifi-call.
help?
Click to expand...
Click to collapse
I'm using the Pixel 6a in Germany with o2 too - I've no issues with VoWifi and VoLTE. Are you shure you've enabled WLAN call in the accordant settings?
I use Google Voice...there an easier way w/o picking up an additional phone #?
On AT&T in the US...which is prolly why...lol
accuphase said:
I'm using the Pixel 6a in Germany with o2 too - I've no issues with VoWifi and VoLTE. Are you shure you've enabled WLAN call in the accordant settings?
Click to expand...
Click to collapse
i wrote that i used wifi calling with the redmi just fine, so i guess i know how to set it up, yes. so far i tried two o2 cards, no luck. question is, can you (you) really do phone calls by wifi or are you just using cellular without actually knowing. can you still do phone calls when airplane mode is on but wifi is enabled? do you see the wifi-icon onscreen (below number/name you're calling) when making a call?
realCyphox said:
i wrote that i used wifi calling with the redmi just fine, so i guess i know how to set it up, yes. so far i tried two o2 cards, no luck. question is, can you (you) really do phone calls by wifi or are you just using cellular without actually knowing. can you still do phone calls when airplane mode is on but wifi is enabled? do you see the wifi-icon onscreen (below number/name you're calling) when making a call?
Click to expand...
Click to collapse
can you really do phone calls by wifi ? Yes
can you still do phone calls when airplane mode is on but wifi is enabled? Yes
do you see the wifi-icon onscreen (below number/name you're calling) when making a call? Yes
realCyphox said:
i wrote that i used wifi calling with the redmi just fine, so i guess i know how to set it up, yes. so far i tried two o2 cards, no luck. question is, can you (you) really do phone calls by wifi or are you just using cellular without actually knowing. can you still do phone calls when airplane mode is on but wifi is enabled? do you see the wifi-icon onscreen (below number/name you're calling) when making a call?
Click to expand...
Click to collapse
Hi,
I'm having similar issues with my Pixel 6a, also in Germany. I use it with two SIM cards (o2/Telefonica physical SIM card and Vodafone eSIM). I have enabled Wifi Calling in the SIM card settings for both SIM Cards, but _most_ of the time, it doesn't work. The phone tries to use placing calls over cellular (my home office is in my basement, so cellular reception is pretty bad to non-existent, especially with Vodafone)
Most of the times, because sometimes it does work, then it shows up in the status bar and the wifi symbol is shown when placing a call. I couldn't yet figure out any correlation to when or why it works or doesn't, I have tried restarting the phone, putting it to airplane mode, deactivating and re-activating Wifi-calling - or just using one SIM card.
I'd say ~90% of the time it doesn't work.
btw I have used a Pixel 4a with the exact same setup / SIM cards before and didn't experience any issue whatsoever.
Do you have any workaround in the meantime?
Not sure if this helps any, but when entering *#*#4636#*#* on dialpad, going into 'Phone Information'
Is WIFI Calling Provisioned enabled like in my attachment?
Worth looking into:
How to Enable the Preferred WiFi Calling Option on the Verizon Pixel & Pixel XL
A tutorial on how to enable the Wifi Preferred mode in the WiFi Calling settings on the Verizon Google Pixel and Google Pixel XL.
www.xda-developers.com
andybones said:
Not sure if this helps any, but when entering *#*#4636#*#* on dialpad, going into 'Phone Information'
Is WIFI Calling Provisioned enabled like in my attachment?
Worth looking into:
How to Enable the Preferred WiFi Calling Option on the Verizon Pixel & Pixel XL
A tutorial on how to enable the Wifi Preferred mode in the WiFi Calling settings on the Verizon Google Pixel and Google Pixel XL.
www.xda-developers.com
Click to expand...
Click to collapse
Thanks for your answer. It is enabled for both sim cards indeed, though (WLAN-Anrufe eingerichtet is the option in German).
koenichlich said:
Thanks for your answer. It is enabled for both sim cards indeed, though (WLAN-Anrufe eingerichtet is the option in German).
Click to expand...
Click to collapse
Very welcome.
I'm sorry, I wish I was able to help with this!
I have found the error - it's actually caused by Blokada. I'm not sure whether it's just after some update of Blokada (I have used Blokada v5 for quite some time and regularly update) or the combination of Pixel 6a with Blokada, though. But Wifi calling always does work, when I disable Blokada.
Than I found this thread and have subsequently added com.android.phone and com.android.providers.telephony as bypass nad it does seem to work until now. Somebody else suggested bypass of Carrier provisioning service, I haven't tested yet, since as said it does seem to work now.
Just wanted to share my findings, if somebody else stumbles upon this thread.