IP = Ingress Protection. Two digits: first = dust protection (0–6), second = water protection (0–9).
Common ratings:
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IP53: Limited dust protection + light rain (splash resistant – most budget phones).
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IP67: Dust-tight + up to 1m for 30 minutes (good for accidental drops in sink/puddle).
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IP68: Dust-tight + beyond 1m (usually 1.5–6m for 30 minutes) – standard on flagships.
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IP69K: High-pressure, high-temperature water jets (extremely rare on phones).
Important caveats:
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Water-resistant ≠ waterproof. Liquid damage is not covered by warranty on virtually any phone.
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Ratings apply to fresh clean water only (saltwater, soapy water, chlorine will degrade seals over time).
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Seals naturally degrade over 1–2 years (drops, repairs, heat, age).
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Never charge a wet phone – wait until fully dry.