10
Not sure if it's possible to make calls, but sounds like a KDE Connect feature.
Kde connect should be able to do it maybe?
https://www.reddit.com/r/kde/comments/gfr7ii/kde_connect_for_receive_and_answer_calls/
No, sadly you can see SMS and calls and even initiate calls in some cases, but you can't use the PC microphone and speakers/headset for talking to people.
Shit, just linux.
Use this community for anything related to linux for now, if it gets too huge maybe there will be some sort of meme/gaming/shitpost spinoff. Currently though… go nuts