Differences between IMEI and imsi

What is the difference between IMEI and imsi. What do they mean? What is the actual purpose. Questioner: lifc time: Fox19850518 Answer International Mobile customer identification code (imsi) In order to correctly identify a mobile customer on the wireless path and the entire GSM mobile communication network, a specific identification code must be assigned to the mobile customer. This identifier is called the International Mobile customer identification code (imsi). It is used in all signals of the GSM mobile communication network and is stored in the customer identification module (SIM), HLR, and vlr. The imsi number structure is mcc mnc msin | ------------ International Mobile customer identification ------------ | -- domestic mobile customer identification -- | MCC = Mobile country number, which consists of three digits, the only country that identifies a mobile customer. China is 460. MNC = mobile network number, composed of two digits, used to identify the mobile network that a mobile customer belongs. China Mobile's GSM plmn network is 00, and China Unicom's GSM plmn network is 0l. Msin = Mobile customer identification code, which consists of 11 digits. Uniquely identifies China Mobile clients in China's GSM mobile communication network. International mobile device identification code (IMEI) Uniquely identifies the code of a mobile device, which is a 15-digit decimal number. Its structure is: 6-digit, 2-digit, 6-digit, L-digit, Tac fac snr sp tac = model approval code, allocated by the European model Certification Center. FAC = factory assembly code, which is coded by the manufacturer to indicate the manufacturer and Its Assembly location. SNR = sequential number, which is allocated by the manufacturer. Identifies a device in each TAC and FAC. SP = standby for future use.