I can only assume there is no one on here that has an AweSIM that is working with VoLTE in their Librem 5? This is really sad, as the lack of VoLTE is basically the last thing that is preventing the Librem 5 from being a legitimate smartphone (even one I am hoping will be my daily driver for my personal phone). The Librem 5 is a very neat pocket computer in a (thick) smartphone form factor, but without VoLTE to allow for a phone call via a cellular carrier, it’s not really a phone. I say this as someone who has experimented with SIP calling on my Librem 5; SIP calling is nifty, but it’s not ready (or robust enough?) to make it able to be a dependable phone.
As best I can tell, the Pinephone/Pinephone Pro already allows for VoLTE calling (e.g. see this webpage https://wiki.pine64.org/wiki/PinePhone#VoLTE). Perhaps I need to try to get my hands on a Pinephone Pro and install Mobian on it.