How to check an iPhone before buying it used: step-by-step instructions

1. Appearance and packaging

Inspect the body: scratches, dents, and impact marks can indicate drops and potential internal damage.

Check the screws near the charging port — they should be symmetrical. An original iPhone always feels premium: no gaps, and buttons press crisply. The cable and adapter may have been replaced, but this is not critical.

2. IMEI and serial number

Go to: Settings → General → About, and compare the IMEI with the number on the box and SIM tray. Check the IMEI on the Apple website checkcoverage.apple.com — this will tell you if the phone is stolen and whether the warranty is still active.

3. iCloud and "Activate iPhone"

If the iPhone prompts you to enter the previous owner's Apple ID upon startup, it is a locked device. Require the seller to sign out of iCloud: Settings → Apple ID → Sign Out.

Important: if the seller says they will "do it later," it is likely a scam.

 4. Check if the iPhone is refurbished

Enter the serial number on SNDeep.info — if the Model field shows an "R," it is a refurbished iPhone. These are cheaper, and that is not always bad, but it is important to know in advance.

5. Screen and touch

Maximize the brightness and check for backlight bleed or spots. Open Notes and try swiping your finger across the entire screen — the touch response should be uniform. If the screen has a warm tint, it may be an original OLED; if it has a blue tint, it might be fake.

6. Face ID / Touch ID

Set up Face ID — it should not show any errors.

For Touch ID, add a finger in Settings → Touch ID & Passcode.

Important: if Face ID / Touch ID do not work, it means the phone was opened, and the sensor may have been replaced.

7. Speakers, microphone, and vibration

Play loud music — there should be no distortion. Call a friend or use the voice recorder to record your voice — the microphone should work clearly. Switch to silent mode — the vibration should be crisp.

8. Charging and battery

Settings → Battery → Battery Health. If it is below 85%, the battery is already worn out.

Important: if the health shows 100% on an older iPhone, the battery may have been replaced, and it may not be original.

9. Network, Wi-Fi, and Bluetooth

Insert your SIM card and check connectivity. Connect to Wi-Fi and test the internet. Check Bluetooth by connecting AirPods or another device.

10. Check if it is a refurbs or a clone

An original iPhone does not come with dual SIM cards, except for Chinese versions. If there is no App Store, it is a clone. Is the price too low? That is a reason to be cautious.

Conclusion

If the phone passes all checks, you can buy it. If any of the points raise doubts, it is better to decline. Buy iPhones from private sellers only from trusted vendors and always inspect the device before paying.