I could not understand for some time why some numbers just don’t work (call drops immediately). Then I realised they can only be called if modem is set to 2G only mode. I understand there might be routing involved etc but on Nokia it worked out of the box @dos
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I have also noticed this. For me, calling other mobile phones seems to always work, but some numbers to companies and similar don’t work. For example the place I usually to call to order pizza, calling there only works with 2G.
Does that mean that you will go hungry once your country shuts down the 2G network? 
Maybe online ordering is a workaround for you.
Prepping is ongoing. I have lots of canned food.
Interestingly, calling works in one direction but not the other. The pizza place called me back once (when I call them it rings on their end but when they answer the call immediately dies), and when they called me I could answer and that call was fine. So they can call me, but I cannot call them.
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This indicates some incompatibility between the modem and the carrier. You may want to disable VoLTE.
I can confirm that disabling volte makes modem jump to 2G mode and call succeeds
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I’m in Sweden where 2G and 3G have recently been shut down for all but one carrier. The remaining carrier that still supports 2G is Telia (they will keep 2G until Dec 2027), and I do have one phone using that from which I can call the pizza place. However, Telia requires separate APN for MMS and data, so MMS is not working on that phone.
I have tested all four carriers in Sweden, there is only one for which I can get both VoLTE and MMS working and that is the one I’m using now (it’s the carrier called “Tre”). But that’s still not working for calling the pizza place.
So it seems I’m out of options here. If anyone has any other ideas or workarounds to solve this, please let me know.
Wait for new modem model?
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I wonder if it would be possible to add a separate MMS APN for Telia to this file (and if it would be effective):
/usr/share/mobile-broadband-provider-info
@dos?
EDIT: Actually, the MMS APN for Telia Sweden appears to be in the list already.
Does this match what Telia publishes?
<apn carrier="Telia MMS" mcc="240" mnc="01" apn="mms.telia.se" mmsc="http://mmss/" mmsproxy="193.209.134.132" mmsport="80" type="default,mms"/>
Maybe this should be reported here, if that has not been done yet.
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@amarok @janvlug thanks, but I think the mobile-broadband-provider-info thing does not help in this case, that can make configuration more convenient but MMS will anyway not work for any provider that requires different APNs for MMS and data. I think that has to do with this issue:
Or maybe this:
Anyway, my experience from messing around a lot with MMS things earlier is that I can in practice only make it work when the carrier allows using the same APN for MMS and data.
If someone has MMS working for a carrier that requires separate APNs for MMS and data, please let me know, then I will give it another try.
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When you tested before, did you use the name “Telia MMS” as the APN within Chatty’s SMS and MMS settings? Or “Telia” or did you leave it blank? (Just curious.)
I think I just modified the config file directly.
Are you saying that you think MMS can work with different APNs for MMS and data? Are there people who have that working?
I don’t know. I was just hypothesizing that Chatty would search that file for the correct MMS entries (based on APN name) when needed, rather than adhering to the main APN.