IMEI

International Mobile Station Equipment Identity (IMEI):

The international mobile station equipment identity (IMEI) uniquely identifies a mobile station internationally. It is a kind of serial number. The IMEI is allocated by the equipment manufacturer and registered by the network operator, who stores it in the EIR. By means of IMEI, one recognizes obsolete, stolen or non-functional equipment.
There are following parts of an IMEI:
·         Type Approval Code (TAC): 6 decimal places, centrally assigned.
·         Final Assembly Code (FAC): 6 decimal places, assigned by the manufacturer.
·         Serial Number (SNR): 6 decimal places, assigned by the manufacturer.
·         Spare (SP): 1 decimal place.

Thus, IMEI = TAC + FAC + SNR + SP. It uniquely characterizes a mobile station and gives clues about the manufacturer and the date of manufacturing.

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