Thanks Meter 902
Join Date: Aug 2010
Location: Leuven / Sint-Truiden
It will spontaneously burst into flames, even under water.
On a serious note, probably nothing. IP57 is a test made for 30 minutes but chances are it'll survive a lot more. The next level requires endless submersion at a higher depth and that is probably unreasonable to test/expect. I wouldn't try it out though.
You should see the waterproofing as an extra security. Dropped your phone in a puddle, spilled some water over it, need to take a call and it's raining? No problem. It's meant to survive those things. What it is not meant to do is to remain operational while submersed in water (they've said this on their website). It will, but it's not made to be used as an underwater camera or as a shower texting device (even though it can do those things).
Sony Xperia Z2 - D6503, black
Sony Xperia Tablet Z LTE - SGP321, black
Sony Xperia Z1 - C6903, black, backup
Huge Sony (Ericsson) fan.
J210i, K320i, G705, Arc, Elm, Neo, Arc S, Xperia S, Xperia T, Xperia Z, Xperia Z1, Xperia Tablet Z, Xperia Z2