A rating describes a test, not an invincible seal
A phone’s IP code is a standardized way to describe protection against dust and water. In an IP68 rating, the “6” refers to dust protection; the “8” means the device passed a water-immersion test under conditions set for that product. It does not mean the phone is safe at every depth, for any length of time, or in every liquid. Water resistance is a measured limit, not a promise that the case is watertight forever.
Pressure finds the weakest point
A phone keeps water out with barriers around its case, buttons, speakers, and charging port. As a phone goes deeper, the surrounding water presses harder against those barriers. A tiny gap that holds in a controlled test may not hold under greater pressure—or if the phone is moving, struck, or squeezed. The test’s still water also avoids the extra force created by a current or a fast-moving phone.
Pool and seawater add another complication: they are not the clean water used in the test. Chemicals and dissolved salts can affect materials or leave residues around openings, so passing an immersion test does not establish how a device will fare in those liquids.
Protection can weaken with age
Seals can wear, and a drop or repair can compromise the fit of a case even when the damage is hard to see. That is why a phone that once resisted water may be less protected later. The practical consequence is simple: treat an IP rating as backup for an accident, not permission to take the phone swimming. A brief splash and a submerged phone are different risks, even if both look like “just water.”
