Check the model number in Settings > General > About
Look for the first letter of the model number
M = new retail unit
F = refurbished unit
N = replacement unit
P = personalized engraved unit
Check the serial number on Apple’s coverage page
Verify the warranty status and activation date
Inspect the packaging for Apple refurbished labeling
Check for a new battery and outer shell
Look for Apple-certified refurbished documentation
Compare the IMEI on the box, device, and SIM tray
Check battery health in Settings > Battery > Battery Health
Inspect for signs of wear, scratches, or mismatched parts
Confirm the device is unlocked and not activation locked
Verify the purchase receipt and seller details
Check if all accessories are original or Apple-approved
Use Apple Support or Apple Store diagnostics if needed