All the Polaroid film I’ve seen on TV (except in Polaroid commercials) has a black strip all the way across on the back, with white borders only at the top and bottom. All the real Polaroid film I’ve seen has white borders all the way around on both sides.
Speaking of phones, how about when a person gets hung up on, they then start hammering the hook as if instead of guaranteeing they are cut off, it might actually reconnect them.