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  2. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    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).

  3. SIM Registration Act - Wikipedia

    en.wikipedia.org/wiki/SIM_Registration_Act

    The SIM Registration Act, officially designated as Republic Act No. 11934 and commonly referred to as the SIM card law, is a Philippine law mandating the registration of SIM cards before activation. Under the measure, mobile device users, must register their SIM cards, whether prepaid or postpaid. The law was enacted intending to curb ...

  4. International mobile subscriber identity - Wikipedia

    en.wikipedia.org/wiki/International_Mobile...

    www .itu .int /rec /T-REC-E .212. The international mobile subscriber identity ( IMSI; / ˈɪmziː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network. It is also used for acquiring other details of the mobile in the home location register ...

  5. International Mobile Equipment Identity - Wikipedia

    en.wikipedia.org/wiki/International_Mobile...

    Devices without a SIM card slot or eSIM capability usually do not have an IMEI code. However, the IMEI only identifies the device and has no particular relationship to the subscriber. 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 ...

  6. SIM Application Toolkit - Wikipedia

    en.wikipedia.org/wiki/SIM_Application_Toolkit

    SIM Application Toolkit. SIM Application Toolkit ( STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer ...

  7. eSIM - Wikipedia

    en.wikipedia.org/wiki/ESIM

    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.

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