There's no 'VoLTE' option after updating to One UI 4.1.

[chaos3714]

After I updated my phone to the newest version, the VoLTE option no longer existed unlike in Android 11.

I also use Spark NZ which has VoLTE support.

Android 12

I'm also sure that option existed before the One UI 4 update.

Android 11 VoLTE

Plus it's also not because of the network vendor, it might be due to the software update that removed the VoLTE option.

[Samsung_Ruby]

Hi  chaos3714, I'll check with our technical team why this option has been removed. I do believe it is because of the update. Thanks - The Samsung Team