The apple iPhone is currently water resistant but only unofficially after people on YouTube have tested it underwater, and it has lasted for longer than 5 minutes, you can see an example of this here;
To add an official sign of approval for using phones underwater by Apple would give users the confidence to take their phones under the water with them. This opens a whole new category for users, such as underwater videos and photography and also as a tool for divers and surfers alike. Something Apple have shown in their advertisements before as can be seen here;
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