Phone water resistance ratings sound like a promise that a phone will survive water, and they are not. An IP rating describes how a phone performed in a specific laboratory test under controlled conditions, which is a very different thing from how it will behave dropped in a pool or used in the rain for years. Reading the rating for what it actually says, and does not say, prevents the expensive misunderstanding of trusting a number that was never a guarantee.
What the rating measures
An IP rating has two digits. The first describes protection against solids like dust, and the second describes protection against water, with higher numbers meaning more protection. A common phone rating means the phone is fully dust-tight and can withstand immersion in fresh water to a stated depth for a stated time, under the specific conditions of the test. That is a real and useful level of protection against accidents like a spill or a brief drop in a sink.
The crucial words are fresh water and under test conditions. The rating is earned in a lab with clean, still, fresh water at a fixed depth, temperature, and duration. Real water is rarely any of those things, and the gap between the test and reality is where people get caught out.
Why the lab test does not match your life
| The test uses | Real life adds |
|---|---|
| Fresh, clean water | Salt, chlorine, soap, minerals |
| Still water | Pressure from movement, jets, waves |
| A fixed shallow depth | Deeper water with more pressure |
| A brand-new sealed phone | Seals aged by time, heat, and drops |
Every difference in that table works against the phone. Salt water and chlorinated pool water are more damaging than the fresh water of the test, movement and depth add pressure the test never applied, and, most importantly, the seals that earn the rating degrade over time. A phone that was rated when new is not the same phone after two years of heat, drops, and daily wear, which is why manufacturers never promise the rating lasts.
Why seals degrade
Water resistance relies on adhesives and rubber seals around the seams, the ports, and the buttons. These are not permanent. Heat ages them, drops can crack the bonding, and any repair that opens the phone disturbs them, so a phone that has been opened for a screen or battery repair may have lost much of its resistance unless it was carefully resealed, the point made in the guide on what a screen repair actually restores. This is why an older phone, or a repaired one, should be treated as far less water-resistant than its original rating suggests, regardless of what the box said when it was new.
Why warranties exclude liquid damage
Here is the part that surprises people most: even a phone with a high water resistance rating usually has liquid damage excluded from its warranty. This is not a contradiction the manufacturers are hiding; it follows directly from everything above. Because the rating is a lab figure that degrades unpredictably with age and handling, a manufacturer cannot guarantee any given phone will resist water in any given situation, so they rate it for marketing and exclude it from warranty for reality. The rating tells you the phone can survive an accident; the warranty exclusion tells you not to rely on it.
The sensible way to read a water resistance rating is as insurance against accidents, not a licence to use the phone in water. It means a spilled drink or a brief drop in a sink is probably survivable, especially on a newer phone. It does not mean you should swim with it, photograph underwater, or trust it in salt or chlorinated water, and it means less with every year that passes. Treating it as accident protection rather than a swimming feature is the honest interpretation, and it sits alongside the other realistic expectations covered in the guide on what genuinely lasts on a phone, the charging safety in the piece on how fast charging generates heat, and the resale implications in the guide on how phone trade-in values are worked out, since liquid damage devastates resale. Connectivity accessories add their own openings too, as the piece on phone wireless audio notes for ports and seals.
What to do if a phone gets wet
If a phone does get wet despite everything, a few actions improve its chances. Turn it off and leave it off rather than testing whether it still works, because powering a wet phone is what causes short circuits. Dry the outside, and if it was exposed to salt or chlorinated water, the situation is more urgent because those residues are corrosive as they dry. Do not charge it until it is thoroughly dry, since introducing power to a damp charging port is a direct route to damage, and do not use heat sources like hairdryers, which can cause their own harm.
The old advice of burying a wet phone in rice does little of value and can introduce dust and starch into the ports. Simply leaving the phone off, in a dry, well-ventilated place, for a day or more gives moisture time to evaporate, and it is more effective than most home remedies. If the phone was exposed to anything other than clean fresh water, or if it does not behave normally once dry, a professional assessment is worth it, because corrosion from salt or sugary liquids can spread internally over days even after the phone appears to have recovered.
Frequently asked questions
Can I swim with an IP68 phone?
It is not recommended, despite the rating. The rating is earned in still, fresh water at a fixed shallow depth, while swimming adds movement, pressure, depth, and often salt or chlorine, all of which exceed the test conditions. Liquid damage is also excluded from warranty. A high rating means the phone can likely survive an accidental splash or brief dunk, not deliberate swimming.
Does water resistance wear off?
Yes. The seals and adhesives that provide water resistance degrade over time through heat, drops, and daily wear, and any repair that opens the phone disturbs them. A phone rated when new is significantly less resistant after a couple of years, and a repaired phone may have lost much of its resistance unless carefully resealed. Treat an older phone as far less water-resistant than its original rating.
Why is liquid damage not covered?
Because the rating is a laboratory figure that degrades unpredictably with age, handling, and repairs, so a manufacturer cannot guarantee any given phone will resist water in any given situation. They rate it for what a new phone can do in a test and exclude it from warranty because reality varies too much. The rating is accident insurance, not a guarantee.
