Use Sixfab hat as phone?

Has anyone used or is it possible to use the Sixfab cellular hat to make & receive phone calls much like the Adafruit FONA? I am able to use the hat currently to connect to the Internet but am interested in also creating my own phone. There is a project posted on youtube from back in 2018 with some promising results.

![Screen Shot 2021-03-22 at 5.01.48 PM|510x360]
(upload://jaxzYdSWSZAK3jkZBOpbAbAGUrU.jpeg)

Screen Shot 2021-03-22 at 5.02.01 PM

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did you make your phone?
From What I gather it is the choice of modem, not HAT that enables voice/SMS/MMS.

I want to ditch my corporate spy phone but am unclear as to how reliable they are at receiving calls/SMS.

What OS & software are you using to communicate? Iā€™m hoping to use Ubuntu 24.04.