Questions and Answers
What constitutes the Mobile Country Code (MCC) in the IMSI?
Which part of the IMSI represents the home GSM network of the mobile subscriber?
What is the primary purpose of the Temporary Mobile Subscriber Identity (TMSI)?
Which of the following is NOT stored in a Subscriber Identity Module (SIM)?
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What is the correct composition of the International Mobile Equipment Identity (IMEi)?
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How is the IMSI structured in terms of its parts?
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Where can the check digit of the IMEi be found?
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Which of the following is true regarding the PLMN in relation to the IMSI?
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Study Notes
International Mobile Subscriber Identity (IMSI)
- 15-digit number containing unique subscriber information for the GSM network
- Composed of three parts: Mobile Country Code (MCC), Mobile Network Code (MNC), and Mobile Subscriber Identification Number (MSIN)
- MCC: 3 digits identifying the country origin of the subscription
- MNC: 2-3 digits identifying the home GSM network of the mobile subscriber
- MSIN: 9 digits assigned by the service provider to the SIM card
Subscriber Identity Module (SIM)
- A "Smart Card" microprocessor storing network-specific information for authentication and identification
- Contains:
- Ki, A3, and A8 algorithms (subscriber encryption keys)
- IMSI
- MSISDN
- PIN/Personal unlocking key (PUK)
- Preferred Roaming List (PRL)/Barred Roaming List (BRL)
- Phone book
- Last location information or Location Area Code (LAC)
Temporary Mobile Subscriber Identity (TMSI)
- 32-bit hexadecimal number assigned by the Visitor Location Register (VLR)
- Used for security purposes to minimize IMSI transmission over the air
- Specific to a Location Area
International Mobile Equipment Identity (IMEI)
- 15-digit number consisting of an 8-digit Type Allocation Code (TAC) and a 6-digit Serial Number (SN) followed by a Check Digit (CD)
- The 15th digit (check digit) is not transmitted over the air but can be used to verify the legal production of the handset
- TAC identifies the make and model of the handset
- IMEI can be found underneath the battery or by dialing *#06# on a GSM phone
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Description
Learn about the International Mobile Subscriber Identity (IMSI) number, its 3-part composition, and its role in identifying mobile subscribers in GSM networks.
