can we know with the command line that the VOLTE config is bad ?
In the table here I see that there is at least one other person who entered some information for Sweden.
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Yes, it’s possible to check using this on the command line:
bm818-volte-check
The result should be that it says either “state active” or “state not active”.
No. If you do this, you let every application directly access to the modem, bypassing the permission system. There’s no reason to do that.
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@dos thank you!
Do you know if bm818-tools is expected to work in Crimson? Here is an issue about that: bm818-volte and bm818-volte-check not working in PureOS Crimson (#10) · Issues · Librem5 / bm818-tools · GitLab
Works for me.
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That entry pertains to Dogwood, before VoLTE implementation on Librem 5, so quite old, unfortunately.
Apparently there are the following four mobile providers in Sweden:
- Telia
- Tele2
- Telenor
- Tre
I have SIM cards for Telia and Tele2 so those two are the ones I’m testing. VoLTE does not seem to work for either of them. I will ask them and see what happens.
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No.
In the context of my post, to which you were replying, the answer is “no”. I see that later on someone answers “yes” but that is answering a different question i.e. whether it is even possible to check whether VoLTE is enabled.
A little Christmas 
update on this: I talked to support people at Tele2 and Telia, and both of them said they would look into why VoLTE was not working for me. Then Tele2 came back with a message saying “nothing wrong in our network”, so they tried to blame my phone.
Then I went and got me sim cards for the remaining two providers as well, so like a crazy person I now have active sim cards for all four mobile providers in Sweden (Telia, Tele2, Tre, Telenor).
Tested Tre and Telenor and found that VoLTE is working for both of them!
So it’s like this at the moment:
- Telia - VoLTE does not work on my L5, unclear why
- Tele2 - VoLTE does not work on my L5, unclear why
- Tre - VoLTE works on my L5
- Telenor - VoLTE works on my L5
Armed with this info I talked to Tele2 support again and they seemed to agree that if VoLTE works for Tre and Telenor then it’s probably not my phone that is doing something wrong. So now they (Tele2) will look at the problem again.
Bonus: the Tele2 support guy I talked to actually agreed that it’s bad for society to have only two kinds of phones (iphone+android). 
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Is it possible that some of the Mobile Network settings for some carriers tricky and have to be set manually? Maybe Network m\Mode, Network, and Access Point Names, and maybe even Mobile Data and Data Roaming. The pickyness and automaticity might vary with carriers.
Remember that VoLTE is based on VOIP.
Or even … some settings are in the modem firmware and they are correct for two MNOs in Sweden and missing or incorrect for the other two.
Either way, at least @Skalman has options to continue making calls.
Ideally you would update the Wiki for Cellular Providers (as it applies to Sweden): Cellular Providers · Wiki · Librem5 / docs / Librem 5 Community Wiki · GitLab
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You might want to check all the relevant (Sweden) entries for Tele2 and Telia in the files within the /usr/share/mobile-broadband-provider-info/ directory, and confirm with those mobile carriers that the settings (some of which are not visible in the GUI interface) are correct.
It might not be relevant to the VoLTE issue, but it’s worth a shot.
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