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I believe IP ratings are for "resistance" (for a certain depth/period of time). Water "proof" means completely impervious to water, period.

I don't believe any phone is water proof.



http://www.sonymobile.com/global-en/products/phones/xperia-m...


There's a pretty good writeup of the IP ratings, how to interpret them, and how they compare with other phones here:

http://www.pocket-lint.com/news/138727-apple-iphone-7-and-7-...


From your link:

Waterproof

• Down to 1.5 m • Max 30 mins • IP rating 65/68

This is _not_ water PROOF.




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