International Mobile station Equipment Identity (IMEI
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The IMEI is used for equipment identification. An IMEI uniquely identifies a mobile station as a piece or assembly of equipment.
IMEI = TAC + FAC + SNR + sp
TAC = Type Approval Code (6 digits), determined by a central GSM body
FAC = Final Assembly Code (2 digits), identifies the manufacturer
SNR = Serial Number (6 digits), an individual serial number of six digits uniquely identifying all equipment within each TAC and FAC
sp = spare for future use (1 digit)
According to the GSM specification, IMEI has the length of 15 digits.