How to spot water damage on a used phone in ten minutes
A torch, a SIM ejector pin and ten minutes. Where the liquid indicator sits on iPhone and on Android phones, what corrosion looks like at the ports, the speaker and mic tests that expose it, and why a phone that works today can still fail next month.
A torch, a SIM ejector pin and ten minutes will catch most water-damaged phones before money changes hands. Here is the order to run the checks in, and the one check that proves nothing on its own.
Water damage hides better than any other flaw. A phone that has been out in the rain or dropped in a wash basin can look spotless, switch on, sell at a fair price — then fail weeks later, with no warranty.
Start with the liquid indicator
Most phones carry a tiny sticker that changes colour when water touches it. Apple calls it a Liquid Contact Indicator (LCI) and says iPhones built after 2006 have them. Samsung calls its version a Liquid Damage Indicator (LDI).
The indicator “is normally white or silver, but when it comes into contact with water or a liquid containing water, it will turn fully red” (Apple Support). Apple adds that an LCI “won’t be activated because of humidity and temperature changes that are within the product’s environmental requirements” — so a red one cannot be blamed on monsoon air.
Where to look on an iPhone
Pop out the SIM tray and shine a light into the empty slot. Apple’s own footnote ties the indicator to that tray: “When this iPhone model is sold in certain countries or regions, it only supports eSIM and doesn’t have a SIM tray or an externally visible LCI.” Most iPhones sold in India still have a tray, so there is an indicator to read — but not all of them. Apple says the iPhone Air has no physical SIM tray and therefore no externally visible indicator; on a phone like that, go straight to the port, speaker and screen checks.
Apple’s page has a drawing for each model. The sticker is small: Apple suggests a lighted magnifying glass, but a torch and your camera zoom do the same job.
Where to look on Android phones
Samsung puts the LDI “inside the SIM or SD card tray”. Power the phone off, eject the tray, then “shine a flashlight into the SIM/MicroSD slot and check the LDI colour” (Samsung Support). Normal is white, or white with light marks. After liquid contact it reads “pink, purple, or red”.
Other brands rarely publish a diagram. iFixit’s reference guide says the indicators are “often located near ports or vents” and that “cell phones often have one inside the SIM slot” (iFixit). On a Redmi, vivo, Motorola, OnePlus or Lava handset, the tray slot gets the torch first.
A white sticker is not a clean chit
iFixit is blunt in both directions. A tripped indicator shows “only that liquid touched that part of the internals”, and a clean one proves little, because “liquid can affect components, but entirely miss every LCI in the device”. A SIM tray is also a cheap part to replace. So: red, pink or purple means stop. White means keep checking.
Then look at the ports
Corrosion is what liquid leaves behind, and ports are where you see it without a screwdriver. Light up the charging port, the SIM slot edge, and the headphone jack if there is one.
- Green or white powder on or around the pins
- Pins that look dark or dull next to a phone you know is clean
- A chalky film, or a dried tide-mark ring inside the port
- A cable that will not sit firmly, or charges only at one angle
Apple confirms the mechanism: charge an iPhone while the connector is wet and “the pins on the connector or cable can corrode and cause permanent damage or stop functioning” (Apple Support). iFixit tells technicians to look for “rust or other corrosion, burn marks or liquid residue”.
Speakers, earpiece and mics
These sit close to the outside of the phone. Five minutes covers them.
- Loudspeaker. Play a track you know, volume to the top. Listen for rattle, buzz or a flat, muffled sound.
- Earpiece. Make a real call and hold the phone to your ear. It should be clear at half volume.
- Bottom mic. Record a voice note and play it back on the loudspeaker.
- Top mic. Record a short video while talking — many phones use a different mic for video.
- Speakerphone and vibration. Check the call both ways, then ring the phone on silent.
Screen, camera glass and the edges
Look across the display in bright light, not straight at it: a faint cloudy patch, a tide-mark ring or a yellow shadow near one edge all count. Check the rear camera glass at an angle for haze behind it. Then drag a finger slowly around the screen edges and into each corner — dead spots and jumpy touch are reasons to walk. If the panel itself looks wrong, our guide on telling an original display from an aftermarket one covers swapped screens.
Why a phone that works today can fail next month
Most guides stop at “does it switch on”. Liquid failure is slower than that.
The conductors on a phone board sit very close together. Once a liquid carrying salts — tap water, sweat, rain, a cold drink — sits between two of them while the board is powered, metal dissolves on one side and a thin metal thread grows across the gap until it shorts. Engineers call this electrochemical migration. A 2021 study in Scientific Reports states that “the miniaturization of electronic devices and the consequent decrease in the distance between conductive lines have increased the risk of short circuit failure due to electrochemical migration (ECM)”, and that “the presence of ionic contaminants affects the ECM process” (Lee and others, 2021).
Drying a phone removes the puddle. It does not remove the salts.
An IP rating will not save you, and neither will the warranty
Apple rates recent iPhones “IP68 under IEC standard 60529 (maximum depth of 6 metres up to 30 minutes)” — then warns on the same page that “splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear” (Apple Support). Drops, opening the phone and contact with soap or perfume all reduce it. A used phone has usually met a few of those.
The repair bill is yours either way. Apple: “Liquid damage is not covered under warranty, but you might have rights under consumer law.” Samsung India’s warranty page puts it in one line — “warranty shall be void if product has failed under certain conditions/types (example: Waterlogging, misuse etc.)” (Samsung India).
The ten-minute order
| Time | Check | Walk away if |
|---|---|---|
| 0–2 min | SIM tray and slot, with a torch | Indicator is red, pink or purple |
| 2–4 min | Charging port, SIM slot edge, headphone jack | Green or white powder, dark pins, chalky film |
| 4–7 min | Loudspeaker, earpiece, both mics, vibration | Rattle, muffle, distortion, a dead mic |
| 7–9 min | Display edges, camera glass, touch at the corners | Cloudy patches, haze behind glass, dead spots |
| 9–10 min | Dial *#06# and run the free government IMEI check | Blocked, duplicate, or a brand mismatch |
The last row is not about water, but the phone is in your hand, so use the minute: CEIR IMEI check.
How we handle this
Every unit clears a 41-point bench check before it is listed, and the grade on the product page is defined at condition grading. If something slips past the bench, the seven-day replacement covers it and the six-month warranty runs after that. Delivery is free to every pin code and payment is cash on delivery only — no advance, no COD fee.
Run these ten minutes on our parcel too; the day-one routine is in the first ten minutes with a refurbished phone. The IMEI of the handset dispatched is printed on your invoice, and the free CEIR check belongs in the buyer’s hands — on any used phone, from any seller, including us. Browse refurbished mobiles, or start with the Samsung Galaxy A56 5G 128GB — Midnight Blue (Refurbished) at ₹25,199.
Common questions
Where is the water damage indicator on an iPhone?
In the SIM tray slot. Pop the tray out and shine a light inside. Apple's support page has a drawing for every model, and its footnote notes that where a model is sold as eSIM-only it "doesn't have a SIM tray or an externally visible LCI". Most iPhones sold in India still have a tray, so there is an indicator to read — but not all of them. Apple says the iPhone Air has no physical SIM tray and therefore no externally visible indicator; on a phone like that, go straight to the port, speaker and screen checks.
What colour means the phone has been in water?
Apple's indicator is normally white or silver and "will turn fully red" after contact with water. Samsung's is white, or white with light marks, and reads "pink, purple, or red" after liquid contact. Anything pink, purple or red is a reason to stop.
The sticker is still white. Is the phone safe?
Not proven. iFixit's guide says liquid "can affect components, but entirely miss every LCI in the device", so a white sticker only means you should carry on with the port, speaker, mic and screen checks. A SIM tray is also a cheap part to replace.
Where do I look on a Samsung, Redmi or Motorola?
Same place. Samsung documents the indicator as sitting "inside the SIM or SD card tray": power the phone off, eject the tray, then shine a torch into the empty slot. Most other Android brands do not publish a diagram, but iFixit notes that phones often carry one inside the SIM slot or near a port.
My phone is IP68 rated. Doesn't that cover water?
An IP rating describes a new phone in a lab. Apple rates recent iPhones IP68 under IEC standard 60529 to a maximum depth of 6 metres for up to 30 minutes, then says on the same page that "splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear". Drops, opening the phone, and soap or perfume all reduce it.
It got wet once but works perfectly. Should I still worry?
Yes. Drying removes the puddle, not the salts left behind, and corrosion keeps working after that. Research on electrochemical migration shows that ionic contaminants on a board let metal threads grow across the tiny gaps between conductors until they short. That is why a liquid-hit phone can run for weeks and then fail, and no brand's warranty pays for it.
