Ok I found this:

"How do I know if VoLTE is working?
For VoLTE to work, the following conditions have to be met:

Your phone supports VoLTE on Ubuntu Touch.

Your carrier and your SIM card supports VoLTE.

Ubuntu Touch contains a VoLTE configuration for your carrier.

If the conditions are met, and the phone successfully establishes a VoLTE connection, the VoLTE logo will appear after your carrier name in the Network indicator."

My phone does not have the VoLTE logo so I guess, Ubuntu Touch does not contain a VoLTE configuration for my carrier. Does anyone know where I can access a list of supported carriers?

Is there some whitelisting or something that the carrier must do for it to work?

@Keneda It was Android 11.

@idonthatevests said in Can't make or receive calls:

24.04.2

How would I install 24.04.2?

I changed the channel to rc but it's still on 24.04-1.1.

@idonthatevests Thank you. I switched to the daily channel (was on stable) but it didn't help.

Anyone know if there is going to be a solution to this?

I now see that:

Calling over VoLTE is not supported, please check that this is not a requirement in your country.

It seems to be a requirement here in Sweden.

Source: https://devices.ubuntu-touch.io/device/fp4

Just installed Ubuntu Touch on a Fairphone 4.

I can't make calls. It tries to call but there is silence and nothing happens.
Incoming calls result in a message being received that someone tried to call.

SMS and Internet works.

Fairphone 4
Ubuntu Touch 24.04-1.1
Hallon (Tre) is the (Swedish) Operator
voLTE on and off doesn't seem to make a difference.
3G no longer works in Sweden. The phone is set to 2G/3G/4G/5G.
The APN settings seem correct.

I've contacted the operator and they don't seem to know if Ubuntu Touch is supported. The only other low cost operator there is here also doesn't know they say.