Been there and done that with the shorts pocket
So it's ok under water for up to (or down to) 1.5m, I presume anything more and the water pressure would force it's way in?
So the z3c had flaps over the ports but the z5c does not, how does that work with water then any idea?
Jay
From a quick Google the IP rating essentially says that the 6 means:
"6 Dust tight No ingress of dust; complete protection against contact (dust tight)"
and the 8 means:
"8 Immersion beyond 1 m The equipment is suitable for continuous immersion in water under conditions which shall be specified by the manufacturer. However, with certain types of equipment, it can mean that water can enter but only in such a manner that it produces no harmful effects. Test duration: continuous immersion in water
Depth specified by manufacturer, generally up to 3 m"
So I'd read this as you are probably OK up to 3m depth (note I'm accepting no responsibility if this knackers your phone!!

As far as the ports etc I believe the parts of the phone that water would have access to are covered in some sort of water resistant coating!