My iPhone is original or fake?

Purchase Apple Products from the Apple Online Store, Apple Retail Stores, and many Apple-authorized resellers and wireless service providers.

As a point of clarification, the M at the beginning of the serial number does not indicate New/Used status. With Apple’s new random serial numbers, it means absolutely nothing.

For a model number:

M = New

N = Apple replacement unit

F = Apple refurbished unit

C = Engraved.

To check warranty status, input the serial number at: Check Your Service and Support Coverage - Apple Support