That’s the problem with a DESIGN Solution.
Cheaper than a recall, dumber than a box of rocks.
Better Yet… Send Condoms!! Un-lubricated with a reservoir tip. Unrolling them from the top will help you to remember which end is up.
Since condoms are made thin, you will be able to use your phone like normal without suffering premature disconnection.
Hell ya can even get them in colors to accent your wardrobe, although how you can accent yourself with your hand stuck to your ear is a question for fashionistas.