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What they don’t mention is the secret 4th sensor.  A water sensor.  You can see it if you shine a torch into the headphone socket of your iPhone (or iPod Touch).  It’s a round disc at the very bottom of the hole.  If that sensor comes into contact with water it changes colour, permanently.

So what’s the point of that?  Well, if your iPhone gets damaged due to being immersed in water or splashed by a wave, the engineers at the Genius Bar with know and your warranty will be void.  If there is a hardware fault with your iPhone the first thing they do is check the colour of that sensor.  In fact, there is a checkbox on the warranty form that must be filled in to say they have checked it.

In normal use there’s nothing to fear, even in light rain, especially if you have your headphones plugged in.

Maybe there’s a market for some sort of cap to protect that socket (and thus the sensor) so as not to trigger it?