WiFi Calling / VoLTE on Mi 9


mormegil6

Members
Mar 30, 2017
2
13
Hello everyone,

I have been trying to run VoWiFi on my Mi 9 for some time (MIUI 12.6, 21.11.24 Beta, Android 11, Magisk 25.2) but to no avail.

I turned off "carrier check" for VoLTE (*#*#86583#*#*) and VoWiFi (*#*#869434#*#*), so I can see the appropriate switches in the phone's network settings.

I looked through this thread and several others, from which I realized that it might be also about "selecting modem config" on the phone. From what I understand, it is turned on with the code *#*#663368378#*#* - but for me, after entering this code, nothing happens. I also tried to enter there in a different way - by clicking on the kernel version I got to the CIT menu, then 3 dots and "additional tools", "MODEM test tools", and "Change Modem Config". At this point I got the message: "No modem config found". I also found some posts about QPST / PDC, but I also don't see any modem configs there to choose from.

Now I wonder if the lack of these configs is maybe due to the ROM I'm using? Or should I download these configs from somewhere and upload them somehow? I've read also elsewhere, that it could be something related to kernel.prop stuff, but I know nothing about changing this. I would be very grateful for your help. I am currently living in a place with a poor telephone network coverage, WiFi Calling would be very helpful :)
 

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oteruh

Members
Oct 4, 2022
2
3
Hello everyone,

I have been trying to run VoWiFi on my Mi 9 for some time (MIUI 12.6, 21.11.24 Beta, Android 11, Magisk 25.2) but to no avail.

I turned off "carrier check" for VoLTE (*#*#86583#*#*) and VoWiFi (*#*#869434#*#*), so I can see the appropriate switches in the phone's network settings.

I looked through this thread and several others, from which I realized that it might be also about "selecting modem config" on the phone. From what I understand, it is turned on with the code *#*#663368378#*#* - but for me, after entering this code, nothing happens. I also tried to enter there in a different way - by clicking on the kernel version I got to the CIT menu, then 3 dots and "additional tools", "MODEM test tools", and "Change Modem Config". At this point I got the message: "No modem config found". I also found some posts about QPST / PDC, but I also don't see any modem configs there to choose from.

Now I wonder if the lack of these configs is maybe due to the ROM I'm using? Or should I download these configs from somewhere and upload them somehow? I've read also elsewhere, that it could be something related to kernel.prop stuff, but I know nothing about changing this. I would be very grateful for your help. I am currently living in a place with a poor telephone network coverage, WiFi Calling would be very helpful :)
Hello, I'm at the same point, have you got any further?
 

mormegil6

Members
Mar 30, 2017
2
13
Hello, I'm at the same point, have you got any further?
Sadly, no.. I am having a super busy time in life at the moment, but when I'll get past it, I plan on flashing the stable version of the system; see if these modem configs would appear there. I don't remember where I've read that this might be the issue. I've downloaded the v12.5.6.0.RFACNXM ROM and I'll let you know once I'll check it.
Or maybe you want to try, if yes, please let me know if this would work!
 

oteruh

Members
Oct 4, 2022
2
3
Sadly, no.. I am having a super busy time in life at the moment, but when I'll get past it, I plan on flashing the stable version of the system; see if these modem configs would appear there. I don't remember where I've read that this might be the issue. I've downloaded the v12.5.6.0.RFACNXM ROM and I'll let you know once I'll check it.
Or maybe you want to try, if yes, please let me know if this would work!
Hey, I was able to make it work. I must say I have a poco f3. I didn't had the necessary permissions with the stock rom to access modem test tools, but I changed to xiaomi.eu weekly rom and then I could enter, there I loaded the config I needed. I needed to call to my provider to activate volte manually after loading new modem conf. I wish you luck with the rom you mentioned!