GSM Structure
Each ME is identity by IMEI (International Mobile Equipment Identity ). The IMEI number is a 15 digit unique code that is used to identify a mobile phone to a GSM network. The IMEI number can be retrieved by keying in *#06# and the 15 digit unique code will be displayed on the screen. In the unfortunate event that your mobile is misplaced, provision of this IMEI number to the police and telco service provider would be useful.
The Subscriber Identity Module (SIM) is a small smart card which contains both programming and information.The A3 and A8 algorithms are implemented in the Subscriber Identity Module (SIM). Subscriber information, such as the IMSI (International Mobile Subscriber Identity), is stored in the Subscriber Identity Module (SIM).The Subscriber Identity Module (SIM) can be used to store user-defined information such as phonebook entries, Ki(Subscriber Authentication key), TMSI, LAI, Kc (Ciphering key), PIN, Language and Frequency Range.
Mobile Station (MS)
MS of GSM shall include 2 parts. First part is Mobile Equipment (ME) and second part is SIM (Subscriber Identity Module).
Each ME is identity by IMEI (International Mobile Equipment Identity ). The IMEI number is a 15 digit unique code that is used to identify a mobile phone to a GSM network. The IMEI number can be retrieved by keying in *#06# and the 15 digit unique code will be displayed on the screen. In the unfortunate event that your mobile is misplaced, provision of this IMEI number to the police and telco service provider would be useful.The Subscriber Identity Module (SIM) is a small smart card which contains both programming and information.The A3 and A8 algorithms are implemented in the Subscriber Identity Module (SIM). Subscriber information, such as the IMSI (International Mobile Subscriber Identity), is stored in the Subscriber Identity Module (SIM).The Subscriber Identity Module (SIM) can be used to store user-defined information such as phonebook entries, Ki(Subscriber Authentication key), TMSI, LAI, Kc (Ciphering key), PIN, Language and Frequency Range.
IMSI = MCC + MNC + MSIN
MCC:Mobile Country Code 3 digits, MNC:Mobile Network Code 2 digits, MSIN: Mobile Subscriber Identification Number 10 digits
MCC:Mobile Country Code 3 digits, MNC:Mobile Network Code 2 digits, MSIN: Mobile Subscriber Identification Number 10 digits
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