Really, I'm tired of all this UI "inovation." just give me a TTY already, it works fine on my laptop and it would work fine on my phone if everything weren't all tied up in closed blobs.
This only works if other people can use KDE if they want all the flashy stuff.
I still work mostly with gui because I do not have autism but easily a quarter of my time is spent in Termux.
I don't think it worked.
% call 6175007369
...on my phone. And git would make an awesome contact list manager.
$ open facetime-audio:6175007369
That URL scheme can also be used on iOS.
[CLARIFICATION EDIT: this places a FaceTime Audio call. The number you're calling would need to be a contact who can accept that call. Not exactly general-purpose.]