34   April 14, 2004  6809471A72-O
Subscriber Identity Module (SIM) and Identification  V80
International Mobile Station Equipment Identity (IMEI)
The International Mobile station Equipment Identity (IMEI) number is an 
individual number unique to the PCB and is stored within the unit's memory. 
The IMEI uniquely identifies an individual mobile station and thereby provides a 
means for controlling access to GSM networks based on mobile station types or 
individual units. The full IMEI structure is listed in Table 2.
Where
TAC Type Allocation Code, formerly known as Type Approval Code
NN Reporting body identifier
XXXX Type Identifier 
YY YY is set to 00 from 01/01/2003 until 31/03/2004
ZZZZZZ Individual unit serial number
A Phase 1 = 0. 
Phase 2 = check digit defined as a function of all other IMEI digits 
Other label number configurations present are: 
• TRANSCEIVER NUMBER: Identifies the product type. Normally the SWF 
number. (i.e. V100).
• PACKAGE NUMBER: Identifies the equipment type, mode, and language in 
which the product is shipped.
Table 2. IMEI Number Breakdown
TAC Serial Number Check Digit
NNXXXX YY ZZZZZZ A