Come on, try to be objective here. We don't see hip level. We see the phone move less than 6 inches (like two phone widths) in the shot when it moves down out of frame. You can literally measure how far it moves before it's out of frame if you look up the size of an iPhone.

https://imgur.com/a/TCLYiTb

Edit: Yes, you can measure things this way when you know the movement plane is roughly parallel to the camera's picture plane. Source: I survey things for my job, and most of the people in this thread are speculating about things they don't seem to understand even at a basic level.