How to check electronics: serials, ports and packaging

Start with the serial number

Most devices have a serial number in three places: on the device or under a lid, on the box label, and in the device's own settings. All three should match.

1. 1Find the serial in the device settings (usually under About)
2. 2Compare it with the number printed on the box label
3. 3Compare it with the number on the device itself, where there is one
4. 4Enter it on the manufacturer's own coverage or warranty page

Build quality

• Seams between parts are tight and even all the way round
• Buttons press with a firm, consistent click
• Ports are centred and cleanly cut, and cables fit snugly
• Printing on the device is sharp and in the brand's font
• The weight is close to the official figure for the model
• Screws are the type the brand uses, with no scratches from earlier opening

Software and features

• The settings show the right model name, storage and software version
• The device installs official software updates
• Brand features work as they should, such as account sign-in, device-finding services and the official app store
• The screen, cameras, speakers and microphones match what the model should have

A cheap phone dressed up as a premium model often runs a skin over different software. Look for odd fonts, missing settings or an app store that is not the official one.

Packaging and accessories

• The box is rigid, with sharp printing and correct model details on the label
• Seals and wrapping match how the brand packs that product
• Cables and adapters carry the brand's markings and look well made
• Manuals and inserts have no spelling mistakes or blurry print

Chargers and batteries

• A genuine charger feels dense and solid; a fake is often very light
• Printing on the charger is sharp and complete, with the correct ratings
• The pins are straight, smooth and firmly fixed

Photos to take for a check

1. 1The serial number on the device
2. 2The box with its serial label
3. 3Ports, seams and printing, close up
4. 4The accessories and cables

A screenshot of the About screen in the device settings is useful evidence too.