For the second-hand market, checking the serial number is a critical safeguard against fraud and financial loss. The used electronics market is rife with pitfalls, from stolen goods to devices with hidden defects. By checking the serial number, a prospective buyer can verify the warranty status. They can see if the device is still covered by Apple’s limited warranty or if an AppleCare+ plan is active. More importantly, this check can reveal if a device has a "Activation Lock" or is reported as lost or stolen. Buying a device that is Activation Locked renders it useless, turning a potential bargain into an expensive paperweight. Therefore, the serial number acts as a title search for electronics, providing the buyer with the confidence to proceed with a transaction.
If the serial number fails to validate:
If you're having trouble finding the serial number on your device, try: check apple serial number
If the seller refuses to provide the serial — walk away. For the second-hand market, checking the serial number
Look at the bottom case near the regulatory markings. They can see if the device is still
