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SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).
One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card containing a user's subscription information and phone book. This allows users to retain their information after switching handsets. Alternatively, users can change networks or network identities without switching ...
Dual SIM. A modern Samsung Galaxy phone with two SIM card slots. It uses nano-SIM instead of the normal sized SIM. Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support ...
An eSIM ( embedded SIM) is a form of SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, typically made of PVC, an eSIM consists of software installed onto an eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM information.
A SIM swap scam (also known as port-out scam, SIM splitting, [1] simjacking, and SIM swapping) [2] is a type of account takeover fraud that generally targets a weakness in two-factor authentication and two-step verification in which the second factor or step is a text message (SMS) or call placed to a mobile telephone.
A SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM-free or ...
Multi-SIM card. Multi-SIM technology allows cloning up to 12 GSM SIM cards (of format COMP128v1) into one card. The subscriber can leave the original cards in a secure place and use only the multi-SIM card in day to day life. For telecom operator-provided cards, only the Group MSISDN number is known to multi-SIM subscribers.
SIM card or Subscriber Identity Module, used by mobile telephones. HP Systems Insight Manager, a system management tool. Scientific instrument module in the Apollo command and service module. Security information management in computer security. Selected ion monitoring, a mass spectrometry scanning mode.
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