4G VoLTE calls confirmed working with carrier x

[spazz]

Hi Kevin.
Ah! Living in zi good schnitzel-town! (:  
Thanks so much for the replies. 
They have been confidence-inspiring. 
I think based on what has been said already and previous confirmations from dcinoz,
I will just chance it and buy one.
If necessary, I am even happy to keep moving carriers until I find one that works with the pinephone's modem f/w    (and if I do, I will be happy to let each carrier know WHY I dropped them).
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@ pjsf
Hey pjsf,
thanks so much for that reply! I don't know why I didn't think to check github,
(or if I had, I probably wouldn't have had any idea what to start to locate what I needed to flash the phone with if it wasn't for your reply and this thread in general). 

So: thanks so much for sharing that. 
Glad you did the testing on that f/w.  

I had a brief read through the f/w flashing instructions, and it is not over my head.
Happy to try that if necessary, and take care not to brick. 

Any other input or experiences are much appreciated, but I feel like I've learned a bit already, and I know where else to research now, and have a few things to try.

Thanks everybody!