VoLTE & VoWiFi not working or configurable after CarrierConfig2 introduction

pachulo

Hi all! I have an Pixel 6a and VoLTE & VoWiFi were both working fine before the latest update. Now they don't work and I can't configure anything related to them.

I suspect it's related to this change:

replace our changes to AOSP APN and CarrierConfig configurations with a GrapheneOS CarrierConfig2 app for easier maintenance, improved MVNO support and support for recently added configuration options

I couldn't find any new application with that name, so my question would be: is there any way to overwrite the network operator provisioned values for VoLTE & VoWiFi support?

Thanks!

muhomorr

pachulo How do you know that VoLTE & VoWiFi were working before?

treequell

Hello there, and thanks for reporting this. Please could you tell us your carrier settings version? It's shown under the "Carrier settings version" item in Settings -> Network & internet -> SIMs.

pachulo

Sure:

jazztel_es-44000000059
MCC: 214 MNC: 03
MVNO: spn: JAZZTEL
2023-05-11

Thanks again!

pachulo

muhomorr

Because the connection was not downgrading to HSPA when making/receiving phone calls. Besides, VoiceHD was always active.
Regarding VoWiFi, as soon as I connected to a WiFi, the mobile network identificator changed to JAZZTEL WIFI, or something like that.

I've looked into this issue. VoLTE & VoWiFi weren't supposed to be available for Jazztel, they aren't available on stock OS.

Totally; that's why I asked on my 1st message if there's a way to overwrite the carrier settings now, as this was possible before the introduction of the CarrierConfig2 app.

You have reported previously that they weren't working properly before:

That was a problem where VoLTE was only working properly after setting airplane mode on and off after being connected to a WiFi network. I think this was related to an AOSP bug, because it was solved after 2 months or so.

Thanks for looking at this!

muhomorr

I've looked into this issue. VoLTE & VoWiFi weren't supposed to be available for Jazztel, they aren't available on stock OS:
https://comunidad.jazztel.com/t5/Smartphones-y-Objetos-Conectados/SOLUCIONADO-Google-pixel-6-sin-homologar-por-Jazztel-para-vowifi/m-p/53536
https://support.google.com/pixelphone/thread/203926959/no-puedo-activar-volte-con-jazztel-en-mi-pixel-7
https://support.google.com/pixelphone/thread/219549335/imposibilidad-de-activar-volte-y-vowifi-en-pixel-7-con-jazztel

You have reported previously that they weren't working properly before:
https://discuss.grapheneos.org/d/4116-grapheneos-version-2023032600-released

muhomorr

pachulo

Totally; that's why I asked on my 1st message if there's a way to overwrite the carrier settings now, as this was possible before the introduction of the CarrierConfig2 app.

There wasn't a way to overwrite carrier settings: non-default carrier settings were applied without an option to use the default ones.

Specifically, a part of carrier settings for "Orange" MNO was used instead of the corresponding settings for "Jazztel" MVNO. This was a bug, though in this particular case it made VoLTE/VoWiFi work.

Supporting user-controlled carrier settings overrides is planned, but there's no concrete timeline:
https://github.com/GrapheneOS/os-issue-tracker/issues/956

pachulo

OK, everything is more clear now; thanks for all the explanations!

I guess I will have to look at the https://github.com/kyujin-cho/pixel-volte-patch approach while a proper solution to override carrier settings is implemented in GrapheneOS, because it seems that waiting for Jazztel to homologate the newer pixels will take longer.