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.

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(upload://jaxzYdSWSZAK3jkZBOpbAbAGUrU.jpeg)

Screen Shot 2021-03-22 at 5.02.01 PM

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