Phone Check: Used Phone Test

Phone test for buying or selling a used phone: 26 hardware tests, one screen at a time, and a report with the numbers behind every result. ▶ BUYER RE-CHECK WITH THE SELLER'S QR • The seller shows the report's QR code; the buyer scans it in Buyer re-check. • 10 core tests run again on the phone in front of them: touch grid, colour screens, loudspeaker, microphone, vibration, both cameras, charging port, volume buttons, fingerprint / face unlock. • Seller's result and today's side by side: unchanged ✔, worse now ⚠. • Model, codename, system level and build fingerprint hash: same model and build, system updated, or a different phone. • You see whether the QR still matches its 10-character code. ▶ THE SENSORS CHECK EACH OTHER • Loudspeaker: three tones in a random order; the microphone must hear all three, in that order, at least 12 dB above the noise. • Microphone: a silent mic is told apart from a refused permission; your voice must be 20 dB above the room. • Vibration: the accelerometer feels the pattern on a table. • Light and proximity: cover the sensor or wave a hand; the reading must change. • Volume keys, power key and charging port are detected when you press them or plug in. • You are asked when the automatic check can't confirm a result. The speaker fallback plays 2 to 5 random beeps for you to count. ▶ SHOWN VS ACTUAL • The system version the phone shows vs the system level it really runs. • Memory read from the kernel vs the RAM the seller claims; storage, real rear photo megapixels (with a pixel binning note) and model vs the ad. • A difference reads "Doesn't match" with a hint to compare in Settings. ▶ 26 TESTS • Screen: colour pages (tap to mark spots), grey pages for burn-in, touch grid, multi-touch. • Loudspeaker, earpiece, microphone, vibration, accelerometer, gyroscope, compass, barometer, light, proximity. • Flashlight, rear and front camera (black-picture check, photo size, sharpness index). • Buttons, charging port, battery, Wi-Fi, Bluetooth, GPS satellites, fingerprint / face unlock, SIM. ▶ A REPORT YOU CAN SHARE • Each item: passed, failed, couldn't check (with the reason) or not present, plus numbers and what to do next. • Share a PDF or an image card with the code and QR. Add a seller note and the last 4 IMEI digits, typed by you. • The newest 50 reports stay on this phone. 12-item hand-over checklist. ▶ GOOD TO KNOW • "Passed" needs a measurement above its threshold; "failed" means no response or you confirmed the problem; in between is "couldn't check". • The speaker test shows that sound comes out. Buzzing and rattling are your call. • Some phones switch the proximity sensor on just during calls (then: "couldn't check"). • Battery values are what the phone reports. Phones don't give apps the battery's wear level, so none is shown; the full-charge estimate can be off by 15 % or more. • The report code shows whether a report was changed after it was made. On its own it proves nothing: re-check the phone in person. • Not checked: sudden power-offs, overheating, water damage, replaced parts, call quality, extra lenses, NFC. Dead pixels are found by your eyes. • The IMEI digits are typed by you. Test photos and recordings are not kept after their test; location is used for the GPS test alone. • No sign-up; reports leave the phone when you share them. • Ads appear on the three tabs, at start-up and sometimes when you return to the tabs, never during a test, on an open report or in a re-check.

Start a full check walks through 26 hardware tests, one screen at a time: touch, speakers, sensors, cameras, charging and more. Make report adds a 10-character code and a QR; Share PDF sends it on. Buyer re-check (scan QR) runs 10 core tests again and lays out Seller's report vs now.