Find the serial number on the iPhone in Settings > General > About
Compare the serial number on the device with the one on the box and receipt
Check the serial number on Apple’s official coverage page: https://checkcoverage.apple.com
Enter the serial number and verify that Apple recognizes the device
Confirm the model name, warranty status, and purchase date details match the iPhone
If Apple says the serial number is invalid, the phone may be fake or altered
Check the serial number format for unusual characters, spacing, or mismatches
Verify the IMEI in Settings > General > About matches the SIM tray or box if available
Use Apple Support or an Apple Store to confirm the serial number if needed
Make sure the serial number is not duplicated across different devices or listings