How do waterproof phones work?

How do waterproof phones actually work? Like how do they stop water getting in through the ports? Surely some water would get in you left the phone in a glass of water? Or are they completely sealed?

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JanSt / MOD  Apr. 8, 2013 at 17:17

There are basically 2 ways: One, you basically seal of the inner workings with a very very fine membrane. Ports have waterproof covers... (like the Sony Xperia Z that can survive 30 minutes in a meter of water)
Two, every part inside is covered in a water repellant...ahem...stuff, that also protects against corrosion without interfering with electrical currents...

Here's a demo video of Liquipel - a so-called nano-coating that can waterproof any gadget...


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