One day my Android phone updated and the interface for accepting/ignoring calls changed. A circle appears and you swipe up to answer and swipe down to ignore. I

One day my Android phone updated and the interface for accepting/ignoring calls changed. A circle appears and you swipe up to answer and swipe down to ignore. I get a call, press on the circle, and swipe up, nothing happens. I press on the circle swipe down, nothing. Turns out the interface depends on the distance swiped up or down, and has nothing to do with the circle. By starting on the circle I didn't have enough runway to trigger the gesture. I love puzzles and felt pretty smart after solving this one after only the fourth missed call.