“It is IP68, it will be fine” is a sentence that has ended a lot of phones. Not because the rating is a lie — it is a real, standardised, independently defined measurement — but because what it measures is narrower than what people hear.
The two digits
IP stands for Ingress Protection. The first digit is solids, the second is liquids. On a phone the first digit is almost always 6, which is the top of that scale: dust tight. It is the second digit that varies and the second digit people argue about.
The four things the test does not cover
- Anything but fresh water
- The test is still, clean, fresh water. Salt water is conductive and corrosive. Chlorinated water is aggressive to seals. Soapy water and anything with surfactants in it — shampoo, washing-up liquid, sunscreen — lowers surface tension, which is precisely what lets liquid through a gap that would have held clean water out.
- Pressure and movement
- Immersion in still water and a jet of water are different forces entirely. A shower, a tap, a wave, a jet ski, a washing machine, a dive below a couple of metres — all of these apply pressure the test never applied.
- Age
- The rating is measured on a device fresh from the line. Adhesive seals age, harden and shrink. A drop that left no visible mark can still have flexed the frame enough to open a path. A phone that has been opened for a screen or battery replacement is very unlikely to hold its original rating unless the seals were replaced properly.
- Heat and steam
- Steam is smaller and more mobile than liquid water and moves with temperature differences. Taking a phone into a hot shower, a sauna, or a steam room is one of the most reliable ways to get moisture inside a device that would have survived being dropped in a sink.
Why liquid damage is not covered
This is the part that generates the most anger at a service counter, and it is worth knowing before rather than after. Every major manufacturer markets water resistance and every major manufacturer excludes liquid damage from the standard warranty. Both of those are on the same page of the same document.
The logic, from their side, is that they can guarantee a device left the factory meeting a laboratory standard, and cannot guarantee anything about the conditions it met afterwards or the state of its seals two years and one drop later. There are also liquid contact indicators inside — small stickers that turn red permanently — so the question of whether a phone has been wet is not usually up for debate.
The practical version: treat the rating as insurance against accidents, not as permission. It means a phone knocked into a sink is very likely fine. It does not mean the phone is a swimming accessory.
The speaker is outside the seal
Here is the thing that explains why a fully water-resistant phone still sounds terrible after it gets wet, and it is the single most useful fact on this page.
A speaker has to move air to make sound, so it cannot be sealed. What manufacturers do instead is seal the electronics behind the speaker and accept that the speaker cavity itself will get wet. The mesh you can see is there to keep solids out, not water. So an IP68 phone that has been in a pool is working exactly as designed: the inside is dry, the speaker cavity is full of water, and the sound is muffled until the water leaves.
This is why water in a speaker is not a symptom of a failed seal and not usually a cause for worry. It is also why it clears so easily: the water is on the outside of the sealed part of the phone, in a cavity with an opening, and a low-frequency tone at full volume pushes it straight back out of that opening.
Living with it sensibly
- Rinse after salt or chlorine. Brief, gentle, clean fresh water on the outside, then dry properly. What corrodes a phone is the residue, not the swim.
- Dry and clear the speakers the same day. While the water is liquid it can be pushed. Once it dries it leaves salt and minerals behind as a solid.
- Do not charge a wet phone. The liquid-detection warning is right and overriding it is how a survivable dunking becomes a repair.
- Assume less resistance as the phone ages. A three-year-old handset that has been dropped twice is not the device the laboratory tested.
- Take the case off to dry it. Water sits between case and phone for hours and runs back in.
- If it went in salt water, watch it for a week. Corrosion damage frequently shows up days later, not immediately. The first thirty minutes covers the rest.