Liquid Contact Indicator: where it is and what it means
Almost every modern phone carries a small sticker that changes colour on contact with liquid. Finding it takes ten seconds and converts guesswork into a fact — including for any warranty conversation, because it is the first thing a technician or manufacturer will check.
What it actually is
A Liquid Contact Indicator, usually abbreviated to LCI, is a small adhesive strip treated with a water-reactive dye. In its normal state it is white or silver-white, sometimes with a fine red or pink cross-hatch pattern. When liquid touches it, the dye spreads irreversibly and the strip turns solid pink or red.
It cannot be reset. That is the point — it exists so a manufacturer can distinguish liquid damage from a manufacturing defect.
Where to look, by manufacturer
| Device | Location |
|---|---|
| iPhone (models with a SIM tray) | Inside the SIM tray slot, visible with the tray removed |
| iPhone (eSIM-only models) | No user-visible indicator — technician access only |
| Samsung Galaxy | Inside the SIM tray slot |
| Xiaomi / Redmi / Poco | Inside the SIM tray slot |
| OnePlus | Inside the SIM tray slot |
| Vivo / Realme / Oppo | Inside the SIM tray slot |
| Google Pixel | Inside the SIM tray slot on models that have one |
| JioPhone and most feature phones | Frequently none fitted |
| MacBook and laptops | Internal only — requires disassembly |
| AirPods and earbuds | No user-visible indicator |
How to check it
- Power the device off.
- Eject the SIM tray with the supplied tool, a paperclip, or an earring post.
- Shine a light directly into the empty slot. A phone torch works.
- Look for a small strip on the slot wall. White or silver means no liquid contact at that point. Pink or solid red means liquid reached it.
Photograph it while the tray is out. If you later need a warranty conversation, having a dated image of the indicator is more useful than describing it.
What a tripped indicator means in practice
Liquid damage is excluded from standard manufacturer warranty cover almost everywhere, regardless of the device's IP rating. A tripped LCI is the evidence used to apply that exclusion. It does not mean your device is beyond repair — only that the repair will be chargeable.
It also gives you useful information. A white indicator alongside a muffled speaker suggests liquid entered the speaker cavity but did not reach the SIM slot, which is a considerably better position than the reverse.
What it does not tell you
An untripped indicator does not prove the device is dry. It is a single point inside the chassis, and liquid can reach a speaker grille, charging port or camera housing without touching it. Judge by behaviour as well: audio that recovered and then degraded over following days indicates corrosion regardless of what the sticker says.
If it has tripped
Do not charge the device for 24 to 48 hours, and use wireless charging if your model supports it. Then have it inspected — particularly if the liquid was salt water, pool water or anything sugary, all of which leave residue that keeps working on the internals. See the symptoms that mean you need a technician and what a repair actually involves.