![]() ![]() ![]() Contacts – SIM can store around 250 contacts. SMS messages – SIM card can store many SMSĦ. The operator network is divided into different small areas each having an LAI.ĥ. Location Area Identity or LAI– This the information stored in the SIM about the local network available. If both match, the SIM is authenticated.Ĥ. The operator network then compares the SRES_1 it produced and the SRES_2 from the mobile phone. The RAND will be sent to the mobile phone and the SIM then signs it with the Authentication Key and produces the SRES_ 2 which then passes into the operator network. The operator database then generates a Random Number or RAND and signs it with the IMSI and gives another number called Signed Response 1(SRES_ 1). The database in the operating system then searches for incoming IMSI and the associated Authentication key. When the mobile phone first activates using the SIM card, it gets the International Mobile Subscriber Identity or IMSI from the SIM card and transfers it to the mobile operator for authentication. The Authentication Key is also stored in the database of the carrier’s network. Each SIM has a unique Authentication key assigned by the operator during personalization. Authentication Key or Ki – It is a 128 bit used to authentication of the SIM card on the Mobile Network. Its first 3 digits represent Mobile Country Code or MCC, the next 2 to 3 digits represent the Mobile Network Code or MNC, The next digits represent the Mobile Subscriber Identification Number or MSIN.ģ. International Mobile Subscriber Identity or IMSI – It is used to identify the individual operator’s network. The number has sections like Issuer Identification Number or IIN, Individual Account Identification, Check digit, etc.Ģ. Integrated Circuit Card Identifier or ICCID – It is the Primary account number that has 19 digits long. The SIM comes in various data capacities ranging from 32KB to 128K and can store 250 contacts. The SIM also contains other data like Short Message Service Centre number or SMSC, Service Provider Name or SPN, Service Dialing Number or SDN, Value Added Service or VAS, etc. Micro sim has been invented for the latest mobile phones. Out of the many keys, the most important keys are ICCID, IMSI, Authentication key or Ki, Local Area Identification or LAI, and an operator-specific emergency number. The SIM card stores network-specific information to authenticate the identity of the subscriber in the network. Modern SIM cards allow the storage of application data that communicate with the handset or server using the SIM application tool kit. SIM card contains its internal memory in which stores the data, personal and financial information, identity for GSM/CDMA. The data stored in the SIM card includes a unique serial number called ICCID, International Mobile Subscriber Identity or IMSI, Security Authentication information, temporary information about the network, a Personal Identification Number or PIN and a Personal Unblocking code or PUK for unlocking. ![]()
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