Originally Posted by jcobreros
I guess that makes sense. Water tight != Air tight.
This all started because I'm getting so paranoid from reading bad things at XDA. Magnetic port falling, little gap, failing flaps, etc.
I've had it for about a month and haven't had a single problem (14W19). Fingers crossed.
No. Water Tight ≠ Air Tight. Ingress Protection is a measurenet of Dust particle and/or Water Ingress. If you squeeze the air out of your phone the place it in water it will attempt to draw in the water or dust through any slight opening .
The phone according to Sony is IP58 (It is also rated as IP55, I don't believe it can have 2 ratings, clearly Sony don't fully comprehend IP ratings either.)
The First digit refers to particle ingress, in the case of the Z2 it's 5 (Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment; complete protection against contact (dust proof)), this also means it 1,2,3,4 proof too.
The second digit is 8 (The equipment is suitable for continuous immersion in water under conditions which shall be specified by the manufacturer. Normally, this will mean that the equipment is hermetically sealed. 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.)