What OS will actually work with phone calls?

[Nutmeg]

Thanks for the reply. I really, really want to make this phone work! You are probably spot on with the ISP comment. We held on to our basic phones as long as we could and Verizon is pushing them to extinction, but all our computers are Linux run, so it made sense to try the Pinephone, and we will never jump ship to Apple or Google or any of the other evils of the world, but we have to have reliable phone service....