How to check phone water damage

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How much can a tiny sticker tell you about water damage? Less than people think.

A white liquid damage indicator is useful, but it is not a magic truth sticker. It tells you whether moisture reached one tiny indicator inside the phone. It doesn’t tell you how long the phone was wet, whether corrosion has already started, or whether every part of the phone is safe.

Find the liquid damage indicator

Most major phone makers place at least one Liquid Damage Indicator, or LDI, inside the phone. The sticker is usually white when dry and turns pink, purple, or red after liquid exposure.

On many modern Android phones, the easiest place to check is the SIM tray slot. Turn the phone off, eject the SIM tray, and shine a flashlight into the opening. Look for a small strip or dot on the inner wall.

A normal Samsung LDI is white, sometimes with light pink or purple X marks. A solid pink, purple, or red LDI means liquid reached the indicator. Google Pixel phones with a physical SIM tray use a similar idea, although the exact look varies by model.

If the phone has no physical SIM tray, don’t go hunting with tools. Some US Pixel 10, Pixel 10 Pro, and Pixel 10 Pro XL models are eSIM-only, so there may be no user-accessible SIM slot to inspect. In that case, a service center can check internal indicators, but you can’t do the quick SIM-tray check from outside.

Older Android phones with removable batteries may have one LDI on the battery and another on the phone body under the back cover. Those are easy to inspect without opening anything sealed.

Check the USB port and exposed openings

Use a flashlight and look into the USB-C port. Green, blue-green, white, or crusty residue on the contacts is a bad sign. That residue is corrosion or minerals left behind after moisture dries.

Also check the headphone jack if the phone has one, the speaker openings, and the SIM tray gasket. A torn gasket, missing tray, or bent tray can let water in even if the phone once had an IP rating.

Pixel phones can show “Liquid or debris in USB port” or “Unplug charger” when the USB-C port senses a problem. Samsung phones can show a water-drop icon and stop cable charging when moisture is detected. Those warnings are worth taking seriously. High humidity or debris can trigger them too, but don’t ignore repeated warnings.

If a moisture warning appears, unplug the cable, turn the phone off if the port is wet, and let it dry at room temperature. Don’t use a hair dryer, oven, radiator, or heat gun. Heat can damage seals and the battery.

Look at the cameras and display

Take a photo of a white wall or sheet of paper. Fog behind the lens cover appears as a soft hazy patch that doesn’t wipe away. If you can see droplets or mist under the camera glass, the phone needs service.

Water damage can also show up on the screen after a delay. OLED panels may develop dark spots, green tinting, flicker, or blotchy areas. LCD panels may show bright patches, edge bleed, or ghostly stains.

The delay is what catches people. A phone can work fine after a splash and then fail days later as corrosion develops on connectors and board traces.

Watch for behavior changes

Water damage rarely breaks only one thing. It often causes a messy cluster of symptoms.

Watch for ghost touches, dead touch zones, crackly speakers, a muffled microphone, random restarts, weak vibration, charging that connects and disconnects, or battery percentage that jumps around. One symptom can be software. Several symptoms after water exposure point toward hardware.

Battery behavior matters too. If the phone suddenly drains much faster, warms up while idle, or refuses to charge normally, moisture may have reached the battery connector or power management area.

runcheck can help here because it logs battery temperature, drain rate, and charging behavior. If those readings changed after a rainstorm, pool drop, or port warning, liquid damage should be on the list.

Understand what an IP rating really means

IP67 and IP68 ratings are lab test ratings. They don’t mean the phone is waterproof forever.

Many Galaxy phones with IP68 are tested for fresh water exposure up to 1.5 meters for 30 minutes, but the exact rating depends on the model. Pixel documentation also makes the important point: dust and water resistance can diminish or be lost over time from wear, repair, disassembly, or damage.

Salt water, chlorinated pool water, soap, steam, and hot water are harder on seals than clean still water. A phone that survived one accidental splash might still fail after a later drop because the adhesive seals aged or the frame bent.

Buying a used phone? Check more than the sticker

When inspecting a used phone, check the LDI, then test the parts most likely to fail after moisture exposure.

Make a call and confirm both microphones work. Play sound through the earpiece and loudspeaker. Test charging with a known-good cable. Check all cameras. Drag your finger across the whole screen to look for dead touch zones. Try vibration. Open the SIM tray and inspect the gasket.

A clean LDI is a good sign, but it isn’t enough. LDIs can miss some moisture paths, and on a shady used-phone sale, they can be replaced. Trust the full behavior of the phone, not one sticker.