The beginning of Apple's serial number M means that the mobile phone is a genuine retail machine and a brand-new machine. The beginning of serial number n means that the mobile phone is an official replacement, the beginning of n means an official replacement, and the beginning of serial number f means that the mobile phone is an official refurbished machine; The beginning of the serial number P indicates that the mobile phone is custom machine. The official refurbished machine is officially recognized by Apple, and it is also manufactured in strict accordance with the factory inspection standards.

Extended data:

The fourth letter of Apple's serial number represents the production life of the mobile phone. K stands for the first half of 20 13; L stands for the second half of 20 13. M stands for the first half of 20 14; N stands for the second half of 20 14. P stands for the first half of 20 15; Q stands for the second half of 20 15.

The official switch is because the iPhone is returned to the original factory for repair after there is a problem. The equipment brought back after maintenance is called the official switch machine. The official switch machine is also a brand-new machine, because Apple's assembly line basically produces a switch machine (beginning with N) for every 100 conventional mobile phones (beginning with M). It's just that these machines are only after-sales circulation and do not enter formal sales channels.

The first character of the serial number indicates the place of origin; F stands for Zhengzhou in Henan, D stands for Chengdu in Sichuan, C stands for Shenzhen in Guangdong, G0 stands for Heshuo in Shanghai, and G6 stands for the new production line of Foxconn in Shenzhen; The second and third characters of the serial number indicate the production line; The fourth character of the serial number indicates the year of production;