Used iPhone Checklist Before Buying: IMEI, Activation Lock, Battery and Parts

A used iPhone can be a strong purchase when the device history is clear, the seller is genuine and the phone passes a complete inspection. The biggest risks are not always visible. An iPhone may look perfect but still have Activation Lock, unpaid financing, a negative IMEI record, a weak battery, non-genuine parts, liquid damage or a disputed ownership history.

This checklist is designed for buyers who want to reduce those risks before payment.

Verify the seller first

Ask the seller where the iPhone was purchased, why it is being sold, whether it has been repaired, whether it is still under finance and whether the original invoice is available. A trustworthy seller should allow reasonable time for testing and should not object to a detailed receipt.

Be cautious when the seller:

• refuses to meet in a safe public place;
• pressures you to pay immediately;
• cannot explain the ownership history;
• will not remove the Apple account;
• asks for an irreversible payment method;
• offers a price far below the normal market range.

Check the exact model and storage

Open Settings > General > About. Confirm the model name, model number, storage capacity, iOS version, serial number and IMEI. Compare these details with the advertisement and invoice.

Check the IMEI

Dial *#06# or view the identifier in Settings. Compare it with:

• the original box;
• the purchase invoice;
• the SIM tray where applicable;
• any operator or repair record.

If the iPhone uses dual SIM, record both IMEIs. Use an available public or operator check, but remember that one clean result does not cover every finance, insurer or country-specific record. Read IMEI blacklist explained.

Confirm Activation Lock is removed

This is critical. The seller should sign out of the Apple account, disable Find My as required and erase the iPhone. After the reset, start the setup process. If the device asks for the previous owner’s Apple Account credentials, do not complete the purchase.

Never accept a promise that the account will be removed later.

Check carrier lock status

Open Settings > General > About and look for Carrier Lock or Network Provider Lock. Insert the SIM or eSIM you intend to use and test calls, SMS and mobile data.

Check battery health

Open Settings > Battery > Battery Health & Charging. Review maximum capacity and any service warning. A low battery-health percentage does not automatically make the phone unusable, but expected replacement cost should affect the price.

Check Parts and Service History

On supported iPhones, open Settings > General > About and review Parts and Service History. This may show whether components such as the battery, display or camera were replaced and whether Apple recognizes them.

Ask for repair receipts. A repaired iPhone can still be a good purchase, but the work should be disclosed and tested.

Inspect the display

• Test touch response across the full screen.
• Check for dead pixels and burn-in.
• Look for uneven brightness or colour tint.
• Check True Tone where applicable.
• Inspect the frame for lifting or gaps.

Test Face ID or Touch ID

Remove any existing biometric profile and enroll your own during testing. A failed biometric system can indicate damage or an expensive repair.

Test cameras and microphones

Take photos and videos with every camera. Test autofocus, portrait mode, flash, stabilization, microphones and audio playback. Check for dust inside lenses or image shaking.

Test speakers, buttons and ports

Test the earpiece, loudspeaker, volume buttons, side button, mute switch or Action button, charging port, wireless charging and vibration.

Check Wi-Fi, Bluetooth and GPS

Connect to Wi-Fi, pair a Bluetooth device and use Maps to test location. Also test the proximity sensor during a call and screen rotation.

Look for liquid damage

Inspect charging ports, camera lenses, speaker openings and the frame. Fog, corrosion, intermittent charging and unexplained restarts can indicate past liquid exposure.

Check financing and ownership

Ask for evidence that any installment or carrier balance is settled. A phone may work during inspection and later face restrictions. Keep seller messages, advertisement screenshots and payment evidence.

Erase and activate before final payment

The safest order is:

1. complete all checks;
2. have the seller remove Apple and Find My access;
3. erase the iPhone;
4. begin setup with your own SIM or account;
5. confirm activation;
6. then complete payment.

Create a detailed receipt

Include seller and buyer names, date, price, model, colour, storage, IMEI, serial number, included accessories and a statement that the seller is authorized to transfer the device.

Final decision

Do not buy if Activation Lock remains, identifiers do not match, the seller cannot explain ownership, or a critical hardware fault is hidden. A low price does not compensate for an iPhone that may become unusable.