The way iPhone handles incoming calls is probably one of the worst UI elements still around in iOS. Instead of only showing a small alert, the entire screen is taken hostage by a caller. This especially sucks in the age of endless robocalls, yet Apple has shown no motivation to change all of that.
Concept designer Vinoth Ragunathan has come up with a clever solution that fixes all that and it doesn’t even require much work on Apple’s part. All you would have to do is swipe up to dismiss the screen.