GSM Main Identities

IMSI : International Mobile Subscriber IdentityIMSI = MCC + MNC + MSIN

MCC= Mobile Country Code (3 digits)

MNC= Mobile Network Code (2 digit )

MSIN= Mobile Subscriber Identification Number (10 digits)

Ex: IMSI = MCC-MNC-MSIN = 602-03-1234567890 where,

602 Egypt Country Code

03 Etisalat Network Code

1234567890 Mobile Subscriber Identification Number

MCC(3 digits)

MNC

(2 digits)

MSIN

(10 digits)

MSISDN : Mobile Station Integrated Services Digital NetworkMSISDN = CC + NDC + SN

CC= Country Code (2-3 digits)

NDC= Network Destination Code (2-3 digit )

SN= Subscriber Number ( max 10 digits)

Ex: MSISDN = CC-NDC-SN = 20-10-1234567 where,

20 Egypt Country Code

10 Vodafone Network Code

1234567 Subscriber Number

CC(2-3 digits)

NDC

(2-3 digits)

SN

(max. 10 digits)

LAI : Location Area IdentityLAI = MCC + MNC + LAC

MCC= Mobile Country Code (2-3 digits)

MNC= Mobile Network Code (2-3 digit )

LAC= Location Area Code ( max 5 digits)

Ex: LAI= MCC-MNC-LAC = 602-01-12345 where,

602 Egypt Country Code

01Mobinil Network Code

12345 Location Area Code

MCC(3 digits)

MNC

(2 digits)

LAC

(max.5 digits)

CGI : Cell Global IdentityCGI = LAI + CI = MCC + MNC + LAC + CI

MCC = Mobile Country Code (2-3 digits)

MNC = Mobile Network Code (2-3 digit )

LAC = Location Area Code ( max 5 digits)

CI = Cell Identity ( max 5 digits)

Ex: CGI = MCC-MNC-LAC-CI = 602-01-12345-11223 where,

602 Egypt Country Code

01Mobinil Network Code

12345 Location Area Code

11223 Cell Identity

MCC(3 digits)

MNC

(2 digits)

LAC

(max. 5 digits)

CI

(max. 5 digits)

IMEI : International Mobile Equipment IdentificationIMEI = TAC + FAC + SNR + spare (15 digits)

TAC = Type Approval Code, determined by a central GSM body(6 digits)

FAC = Final Assembly Code, identified the manufacturer (2 digit )

SNR = Serial Number( 6 digits)

spare = A spare bit for future use, when transmitted by MS it is always zero.

( 1 digit)

Thank you !