Probably because VoLTE is the technical way of saying it, the user can not be expected to remember every complicated name 
for example you have the option to choose 2G, 3G and 4G not GSM, EDGE, UMTS and LTE.
Was mentioned here in the 4.4.0.68 version.
The settings menu is the preferred way to go, if you have the Xperia 10 II you
can look in the VoLTE on the Xperia 10 II - filling in the gaps thread, if you want to enable VoLTE now, this does NOT apply for the 10 III explained here.
Hi Every body does some one .know how to connect my xperia 10 iii “shh” with putty.
I try to connect with the usb cable plugged . I enable developer mode and distant connexion
I save a password.
I setup an ip adresse for usb.
When i try to connect by ssh by the address i defined before login: “admin” and i wrote my password i s the login user admin? It doesn’t work
Thank you
This is not the thread to ask that kind of questions, this is about VoLTE.
I have created one for you here: How to connect my Xperia 10 iii with putty?
Okay, since I have a 10 iii device, what to do then, if I have such ‘one way 4G calling (VoLTE)’ as described?
My operator (o2 germany) is listed as successfully tested in the thread about vendor/operator compatibility.
MMS is not functioning with T-Mobile
Hi @nerd7473. Would you be able to give a little more detail please? E.g. country, device, your VoLTE status, MMS settings, a link to your operator’s stated MMS settings, etc. It might help to know if others are experiencing the same.
Is it alright if I provide more info after work?
United States,
T-Mobile,
Xperia 10 iii
SailfishOS 4.4.0.68
FYI, There’s one on TM now.
Thanks. Got it watchlisted.
How can VoLTE be activated on x10 plus?
You are not exactly on topic… but the answer is that you can’t. There appears to be no plans for the older devices.
Hi
Yesterday I noticed that VoLTE was enabled on my 10 III and I have not enabled it by running dbus-commands. Fortunately Elisa-FI works fine with VoLTE but I could not find a note from the release notes that it may be activated without user interaction.
Maybe you activated it using the UI, there is a button for it now.
Not very important seen the glitches that still need ironing but will there be a VoLTE icon ;-p
To check registration status, or for what?
That would be nice indeed.
Who needs an icon, you notice if it works, when you call someone who also uses VoLTE you have no ringing tone, that indicates that everything is fine 
Oh that is why I don’t hear a ringtone sometimes haha good to know.
Yes, an icon shows you the status of a function. Like 4G or 3G which I think is quite handy. Some prefer to launch a terminal and send the commands to check on the status but I’m not one of them and thus I’d be happy with some kind of info. Why would we have a 4G and 3G icon if that wasn’t useful? Following the logic of what for even these two could be left out.
But as I said, the folks at Jolla have way more important stuff to do as to implement an icon for a feature that is in beta testing.
Sure an indicator would be nice. If you want to check the status you could install Netmon Volte checker from openrepos.