One of the features that Sony is touting of its Xperia Z5 lineup is the fact that they are IP68 certified. What does this mean? For those who are unfamiliar with the certification, basically this indicates that the phone is both water and dust resistant to a certain extent, meaning that you can probably snap some underwater photos, but no deep sea diving.
Sony writes, “You should not put the device completely underwater or expose it to seawater, salt water, chlorinated water or liquids such as drinks. Abuse and improper use of device will invalidate warranty.” Sony goes on to note that exposure to droplets of rain, touching with wet fingers, or spilling drinks on the device is fine.
However taking it underwater is not OK. Apparently the IP68 rating was given based on strictly controlled experiments, as opposed to real-world testing in which Sony cannot guarantee your phone’s safety. In any case we suppose this is just Sony trying to cover all their legal bases. At the same time damaging your phone while using it underwater will void its warranty, so that’s worth taking note of.