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Question VoLTE not working since OneUI 4.0 Beta installation

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Vazovski2007

Member
Dec 3, 2020
30
0
i downloaded from the link u provided: https://samfw.com/firmware/SM-G991U

but thats s21. i'm going to try this https://samfw.com/firmware/SM-G998U1/TMB
I also used thar firmware.

No 991 and 998 ar different devices.


This is the firmware you want ( i have installed this one)
S21 is 991 model.
998 i assume is s21 ultra

Don't be confused that it is written Model 991U. Mine is 991U1 ;-)

I can support you remotellly if you wand on Monday just share desktop with Anydesk.
 

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Last edited:

Daksh19

New member
Dec 26, 2021
1
0
I also used thar firmware.

No 991 and 998 ar different devices.


This is the firmware you want ( i have installed this one)
S21 is 991 model.
998 i assume is s21 ultra

Don't be confused that it is written Model 991U. Mine is 991U1 ;-)

I can support you remotellly if you wand on Monday just share desktop with Anydesk.
Hey I am also facing the same issue of volte not working.
I wanted to know how to get into bootloader of s21 snapdragon in order to install that firmware.
Thanks
 

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  • 1
    Hi, Thanks for your information that would help
    unfortunately I have waisted lot of time to find out the reason and U firmware helped, could you be so kind to check 1 thing if you are still on U1 ? and VoLTE is working? if yes please can you tell us if the phone number is visible in About Phone > Phone number?
    because on U1 firmware it was never being visible even on android 11
    Yeah, I have U1 model and volte does work now. However there's a bug if you are using volte wifi calling. In case, you connect your device to another wifi, volte goes away and only fix is to reboot the device. Regarding phone number, yeah I can see it in about phone.
  • 1
    Hello All,
    I posted this in Samsung Community, but unfortunately none was able to help. I am hoping XDA members could help fix this issue.

    I am facing a strange problem with my S21 Ultra Unlocked which was directly bought from Samsung. I had enrolled into OneUI 4.0 beta when I was in the US. I was using Sprint connection then.

    I had to travel back to my home country (India) and I am using an Airtel sim card (LTE) here. Now, the strange problem is that LTE (data) works here fine. But, VoLTE is not working. The network changes to 2G for phone calls. I am assuming that the auto-switching bands which was introduced in OneUI 4.0 is causing the problem.

    Using Smart Switch PC, I rolled back to One UI 3.1. VoLTE and WiFi calling started to work again. But, soon after I got update notification for One UI 4 beta. To confirm that it is indeed an issue with One UI 4, I installed it again. And as expected, I am not getting VoLTE or WiFI calling again.

    Since I changed from Sprint to Airtel, I am not able to withdraw from the Beta program as well. I am getting the error "One UI beta features aren't available because your service provider has changed".

    Also, I am not sure what the final One UI 4 will offer. For the first time in my life, I am seeing an Android upgrade causing my phone to not able to connect to VoLTE.

    I am also attaching the screenshots of Phone Information. As you can see, in OneUI 3.1, VoLTE and WiFi calling are provisioned. But in OneUI 4, both are not available. I am assuming the issue is because IMS is not registered. But, I am not able to find how this can be fixed.

    Thanks in advance for your help.

    Thanks,
    APS

    #volte #samsung #s21ultra #oneui #oneui4 #imsservice #ims #airtel #oneuibeta
    1
    Hi, Thanks for your information that would help
    unfortunately I have waisted lot of time to find out the reason and U firmware helped, could you be so kind to check 1 thing if you are still on U1 ? and VoLTE is working? if yes please can you tell us if the phone number is visible in About Phone > Phone number?
    because on U1 firmware it was never being visible even on android 11
    Yeah, I have U1 model and volte does work now. However there's a bug if you are using volte wifi calling. In case, you connect your device to another wifi, volte goes away and only fix is to reboot the device. Regarding phone number, yeah I can see it in about phone.