Earlier quoted context omitted.
>It's a _phone_. Phone calls are it's primary function. No, it's not. You sound like a dinosaur. A phone's primary functions are 1) text-messaging apps, 2) camera, 3) dating apps, 4) banking apps, and various others. Phone calls are somewhere around #20.
Not according to the mobile OS engineering teams at Apple or Google. Phone calls are intentionally given priority over other functions.
Phone calls haven't forced full screen takeovers for several years on iOS, and have the same UX as 3rd party VoIP and Video call apps...