Check the model number in Settings > General > About
Look for the first letter of the model number
M means new retail unit
F means refurbished unit
N means replacement unit
P means personalized engraved unit
Check the battery health in Settings > Battery > Battery Health
Inspect the device for scratches, dents, or mismatched parts
Verify the serial number on Apple’s coverage check page
Check the box and accessories for non-original packaging
Look for “Apple Certified Refurbished” on the purchase listing or invoice
Confirm the warranty status with Apple Support
Check if the device has been reset and set up as new
Compare the IMEI on the device, box, and SIM tray if available
Ask the seller directly for refurbishment details
Review the purchase history or receipt for refurbished labeling