International mobile equipment identification code, commonly known as mobile phone serial number and mobile phone serial number, is used to identify every independent mobile phone and other mobile communication equipment in the mobile phone network, which is equivalent to mobile phone ID card. The serial number * * * has 15~ 17 digits, and the first 8 digits are the model approval number (early 6 digits), which is the code to distinguish the brand and model of the mobile phone. The next two digits (FAC) are the last assembly number (only existed in earlier models), representing the code of the final assembly.
The last 6 bits (SNR) are the serial number, which represents the production serial number. The international mobile equipment identification code is generally attached to the back of the fuselage and the outer packaging, and also exists in the memory of the mobile phone. Enter *#06# on the dial pad of the mobile phone to query.
Imei component
The first part, TAC, is a type assignment code, which consists of 8 digits (6 digits in the early days) and is a code to distinguish the brand and model of mobile phones. This code is assigned by GSMA and its authorized institutions. Among them, the first two digits of TAC code are the identification of the distribution organization and the code that authorizes the distribution organization of IMEI code. For example, 0 1 is CTIA in the United States, 35 is BABT in Britain, and 86 is TAF in China.
The second part FAC, the final assembly code, consists of 2 digits. In the early TAC code, only 6 digits existed in the mobile phone, so TAC and FAC codes add up to 8 digits. FAC codes are used to distinguish the production within the manufacturer.
The third part, SNR, serial number, serial number, consists of six digits starting from the ninth digit, which is used to distinguish the production serial number of each mobile phone.
The fourth part, CD, parity bit and verification code, is calculated by Luhn algorithm from the previous 14 bit.
The fifth part, SVN, software version number, distinguishes different software versions used by the same model mobile phone when it leaves the factory, and only exists in some models of some brands.
Reference to the above content: Baidu Encyclopedia -—IMEI