So you’re talking to Bill on your iPhone, when Erik calls…
You have two immediate questions: who is calling, and how should you respond?
The iPhone addresses these beautifully. The caller’s name appears in large type with the caller’s “location” in smaller type below. Both name and location probably scale horizontally to fit in the available width, so a name like Christoper Columbus will appear smaller, but won’t wrap.
Below the name and location, you see three buttons: Ignore and Hold Call + Answer, in black, relate to the new caller and are grouped together by proximity, while End Call + Answer, in red, relates to the existing call you’re already on.
Except for Home, there are no other buttons. Nothing else to focus on but those two immediate questions: who is calling, and how should you respond?
Will users appreciate this? Oh yes.

What a lovely screen.