First of all: My experience is somewhat ‘mixed’: It was not plain sailing to enable VoLTE support. As there is a setting in the mobile network section to enable ‘4G calling (beta)’, some questions came up:
- why is it named ‘4G calling’ only, and no mention of VoLTE which is the one thing everybody looks for in that case? I’m okay with 4G calling in general, but why omit the official name of the standard behind it, especially when here and in official release notes it is always communicated as VoLTE-support? Such sudden naming changes or variations doesn’t make any sense and only lead to confusion in the general public.
- I don’t remember if this setting in the mobile network section has been introduced in the previous version 4.4.0.64 already, but it is not mentioned in this thread here, which still is the official resource to enable the beta VoLTe functionality. And here we see commands to be issued in the terminal requiring dev-mode to be turned on. So, I asked myself: What is the actual way to enable it now? settings menu or the command?
- In fact I did both: first enabled the setting in the menu, then enabled dev-mode and issued the command. In addition it wasn’t told that you have to do this as root, which caused some more time to figure out, since only one user mentioned it here in the end of this thread (sigh).
- Results: I can receive calls and it seems to be via VoLTE or ‘4G calling’, as the indication in the upper right stays on ‘4G’ → which is quite good at my place. However, 2G is not. And when I initiate a call, there is always a switch to 2G, still. However, this is not usable for me at the moment because of a loss of audio during calls when established using 2G. (see: Loss of audio during phone calls [Xperia 10 iii])
So in a nutshell: Yes, it works (partly) but the way to get to this status could have been better ‘paved’. The result is fine as long as its called ‘beta’ but still: Can anyone explain why it only works when I’m being called and not when I initiate the call?