I think the problem is that the Phone app has a lot of legacy behavior from the early days of the iPhone when people actually used the phone functionality. As t

I think the problem is that the Phone app has a lot of legacy behavior from the early days of the iPhone when people actually used the phone functionality. As the sibling commenter notes, they only recently changed the incoming call notification to not take over the entire screen regardless of what else you were doing. It's just not totally fixed yet.