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Practical guides to testing your phone or laptop, fixing common problems, looking after the battery, and checking a used device before you buy it. Each one links to the free test that goes with it.
Check your webcam and mic in your browser in 30 seconds, read the resolution, frame rate and mic level, and fix the blocked permissions, mute keys and wrong devices behind most camera and mic problems.
Read the guide →Test every part of a laptop in 5 minutes with no download, then check battery health, SSD and RAM with the tools built into Windows, macOS and ChromeOS. Includes a used-laptop checklist and live remote inspection.
Read the guide →Photos, videos and FaceTime calls can be faked. How to check a used phone in person in 10 minutes, and how to inspect one remotely, live, with checks a scammer can’t fake.
Read the guide →Black, colored or white? Two minutes with a color test tells you what kind of fault it is, and whether anything can be done.
Read the guide →Screen tapping by itself? Seven checks in order, from the screen protector and charger to the signs the display itself is failing.
Read the guide →Activation Lock, a clean IMEI, carrier lock, replaced parts and battery health: what to check, in order, before money changes hands.
Read the guide →Usually it is the charger, cable, heat or a setting, not the battery. Seven quick checks, fastest first.
Read the guide →Design capacity, full charge capacity and cycle count: where each system hides them and how to read them.
Read the guide →One question decides the fix: does it fail outside the operating system? Checks for Windows and Mac, from settings to spills.
Read the guide →The free government IMEI check, what the bill and box should show, account locks, a 5-minute hardware test and the scams to avoid on OLX.
Read the guide →Find the IMEI in three places, run the free check for your country, read the result correctly, and what to do if it is flagged.
Read the guide →Clones fake the model name in Settings but not the chip, the screen or the serial number. Six checks that take about ten minutes.
Read the guide →Where each brand hides the battery health figure, what 80% really means, the signs of a worn or swollen battery, and the habits that slow wear.
Read the guide →Most muffled speakers are blocked, wet or misrouted, not broken. Seven checks in order, from settings to cleaning the grille safely.
Read the guide →Step-by-step checklists to work through in person, before you hand over money.
How to open each manufacturer's own hardware tests, read the results and check battery health.
The full phone diagnostic runs 33 checks in the browser, from the screen and touch panel to speakers, cameras and sensors, and ends with a report you can share or print.