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  2. IP Multimedia Services Identity Module - Wikipedia

    en.wikipedia.org/wiki/IP_Multimedia_Services...

    The ISIM application can co-exist with SIM and USIM on the same UICC making it possible to use the same smartcard in both GSM networks and earlier releases of UMTS. Among the data present on ISIM are an IP Multimedia Private Identity (IMPI), the home operator domain name , one or more IP Multimedia Public Identity (IMPU) and a long-term secret ...

  3. Mobile phone tracking - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_tracking

    An indoor location tracking map on a mobile phone. Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. . Localization may be affected by a number of technologies, such as the multilateration of radio signals between (several) cell towers of the network and the phone or by simply

  4. International mobile subscriber identity - Wikipedia

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

    An IMSI is usually presented as a 15-digit number but can be shorter. For example, MTN South Africa's old IMSIs that are still in use in the market are 14 digits long. The first 3 digits represent the mobile country code (MCC), which is followed by the mobile network code (MNC), either 2-digit (European standard) or 3-digit (North American ...

  5. Mobile network codes in ITU region 6xx (Africa) - Wikipedia

    en.wikipedia.org/wiki/Mobile_network_codes_in...

    This list contains the mobile country codes and mobile network codes for networks with country codes between 600 and 699, inclusively – a region that covers Africa and the surrounding islands (excluding the Canary Islands and Madeira, which are part of Spain and Portugal, respectively).

  6. Personal unblocking key - Wikipedia

    en.wikipedia.org/wiki/Personal_unblocking_key

    If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...

  7. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    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.

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