Does Fairphone 4 supports VoLTE ?

AppLee

@stanwood and @adorsaz
It might already be available in Devel.
But I don't have this device to check things out.

Lakotaubp

@AppLee No not yet Marius was working on it.

Ben-LinuxMan

@stanwood I also live in Switzerland
I've got Fairphone 4 running 24.04-1.0 Beta 2 and my carrier is Yallo.

4G VoLTE is turned on but is unfortunately not working.

In the Ubuntu Touch Docs ( https://docs.ubports.com/en/latest/userguide/dailyuse/volte.html) one of the requrements is „Ubuntu Touch contains a VoLTE configuration for your carrier.„

Does anybody know how to create such a configuration?

gandalf

I haven't seen it documented anywhere( or I'm blind ) but it looks like VoLTE was backported(?) to 20.04-OTA10. I did one call so far and did not see the "3g" downgrade in the status bar. And the cellular settings newly offer "Connection Type: 2G/3G/4G/5G"

adorsaz

@Ben-LinuxMan My provider is Yallo too and the VoLTE is working on my LineageOS installation with the Fairphone 4.

For your information, I share below screenshots of the current Android APN confugurations. Maybe that could help you to set up VoLTE on Ubuntu Touch ?

https://cloud.adorsaz.ch/s/Sm4fzxY3nr8dLkM/preview
https://cloud.adorsaz.ch/s/pGDrLHTmZfX8MpS/preview
https://cloud.adorsaz.ch/s/XX3FbaNKqrz9cDD/preview

With the Ububtu Touch noble just released, I'll try to install it again in next days and I'll write here if VoLTE works for me.

Keneda

@adorsaz
VoLTE is for Voice over LTE.
Sadly it has nothing to do with data or SMS and MMS setup.
4G (and 5G I believe) data works perfectly under Ubuntu Touch, same goes for SMS and MMS.

gpatel-fr

@gandalf

Sorry for the idle question, but I have seen on this forum a post complaining that Volte was working yes, but there was no feedback for the call routing, in a word, the user was launching the call, waiting in a void, then suddently hearing the voice of the called person. It was not on a Fairphone, it was with a Volla 23 IIRC, but is this a generic problem with current Volte and Ubuntu Touch ?

gandalf

@gpatel-fr

I just made a call, I got the standard ringing until the other side picked up the phone

~~Though again, I'm not sure if the lack of a "3g" icon is proof enough that volte is actually working Cellular Settings -> Carrier & APN -> 4G calling (VoLTE) is available and enabled~~ see follow up answer

gandalf

said in Does Fairphone 4 supports VoLTE ?:

@gpatel-fr

I just made a call, I got the standard ringing until the other side picked up the phone

~~Though again, I'm not sure if the lack of a "3g" icon is proof enough that volte is actually working~~ Cellular Settings -> Carrier & APN -> 4G calling (VoLTE) is available and enabled

After a bit more testing it looks like that was a false positive Yes, all the settings are there, but following this thread and calling gbus it seems that volte is not actually supported:

$ cat /etc/ofono/binder.d/qti.conf 
[Settings]
ExpectSlots = slot1
extPlugin = qti
radioInterface = 1.4

[slot1]
path = /ril_0
slot = 0

$ gdbus call --system --dest org.ofono --object-path /ril_0 --method org.ofono.IpMultimediaSystem.GetProperties
({'Registered': <false>, 'Registration': <'auto'>, 'VoiceCapable': <false>, 'SmsCapable': <false>},)

adorsaz

Here are steps I've just followed:

Flash Android 11 stock image from fairphone website
Start Android 11, configure phone
In mobile settings, uncheck VoLTE and check it back
Same for wifi calling (uncheck then check)
Make a call and check it's working well with Android. My operator has disabled 3G, so this check ensures me the VoLTE is well working on Android

Then, download UBports Installer 0.11.2 and start the process to install Ubuntu Touch 24.04-1.0 stable channel wipping user data.

Phone seems connected to 4G: the network status icon has letter « L ». Although voice phone call did not work.

I tried to call my Ubuntu Touch device with another Android phone and I didn't received the call on the Ubuntu Touch one.

I tried to run the gdbus command and I got same result than you (neither registered, nor voice and sms capabilities).

On a new test, I've started journalctl -f and I attach the result here. Let me know if more logs are needed.

voice_call.log

Note that before doing the call, I disconnected wifi to be sure to use VoLTE and not VoWifi.

adorsaz

I've just opened an issue on Gitlab so developpers can check the logs and ask me more of them if needed: https://gitlab.com/ubports/development/ubuntu-touch/-/issues/2281

adorsaz

I took time to test with the different update channels available and VoLTE works with current 24.04-0.1/daily channel (update 2025-10-19/3).