Check the actual phone you intend to buy, including its storage capacity and condition. A tidy exterior does not tell you whether the cameras, battery, network connection and charging port work as expected.
Confirm that you can set it up
Ask the seller to demonstrate that the device can be reset and activated without a previous owner’s account. Do not accept an account lock on the promise that it will be removed later. For an iPhone, Apple specifically advises against buying a device with Activation Lock enabled. Follow Apple’s preowned iPhone checklist for model-specific checks, including carrier restrictions and available parts history.
Try the everyday functions
- Use your SIM, where supported, to test a call and mobile data.
- Connect to Wi-Fi and try the Bluetooth accessory you expect to use.
- Record and play back a short video to check picture and sound.
- Try the front and rear cameras, buttons, touch screen and supported biometric unlock.
- Connect a suitable charger and check that charging is stable.
Ask what is known about the battery
Ask for the battery-health information available on that model and any replacement history. Not every phone exposes the same measurements, and a percentage does not promise a particular day’s usage. Ask what battery faults the written warranty covers rather than assuming battery wear is included.
Keep a record of the agreement
Confirm the model, storage, condition, accessories, total price and after-sales terms on your receipt or order record. Keep device identifiers private and compare them with the unit you receive. Read our support information and compare available phones. Ask for any missing details before payment.