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A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
The mobile identification number (MIN) or mobile subscription identification number (MSIN) refers to the 10-digit unique number that a wireless carrier uses to identify a mobile phone, which is the last part of the international mobile subscriber identity (IMSI).
The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
The IMSI is often used as a key in the home location register ("subscriber database") and the MSISDN is the number normally dialed to connect a call to the mobile phone. A SIM has a unique IMSI that does not change, while the MSISDN can change in time, i.e. different MSISDNs can be associated with the SIM.
The IMSI catcher masquerades as a base station and logs the IMSI numbers of all the mobile stations in the area, as they attempt to attach to the IMSI-catcher. [14] It allows forcing the mobile phone connected to it to use no call encryption (A5/0 mode) or to use easily breakable encryption (A5/1 or A5/2 mode), making the call data easy to ...
The IMSI detach procedure informs the network that the Mobile Station is switched off or is unreachable. At power-down the MS requests a signaling channel. Once assigned, the MS sends an IMSI detach message to the VLR. When the VLR receives the IMSI detach-message, the corresponding IMSI is marked as detached by setting the IMSI detach flag.
In 2008, the Bank Administration Institute transferred copyright ownership of the BAI file format to the Accredited Standards Committee X9, Inc. - Financial Industry Standards . As of early 2009, the document is being revised by an X9 committee of bankers and corporate members to become an American National Standard .
IMSI may refer to: International mobile subscriber identity; Intracytoplasmic morphologically selected sperm injection; Interface Marketing Supplier Integration Institute, standards organization; Idaho Maximum Security Institution, prison; International Maple Syrup Institute, see maple syrup; IMSI/Design, a software company, see List of CAx ...