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  2. 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 ...

  3. Local number portability - Wikipedia

    en.wikipedia.org/wiki/Local_number_portability

    The user wakes up using a new SIM-card from the new cell provider while keeping the number. In the mature Spanish cell phone market (as of June 2007, with 107 lines per 100 inhabitants [49]), portability has been widely used by the competing carriers as a way to steal each other's customers, usually offering them free handsets or extra credit.

  4. Phone cloning - Wikipedia

    en.wikipedia.org/wiki/Phone_cloning

    A selection of mobile phones that can be cloned. Code-Division Multiple Access (CDMA) mobile telephone cloning involves gaining access to the device's embedded file system /nvm/num directory via specialized software or placing a modified EEPROM into the target mobile telephone, allowing the Electronic Serial Number (ESN) and/or Mobile Equipment Identifier (MEID) of the mobile phone to be changed.

  5. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    sim card of the new mobile company that will cost around 15 PEN. United States: 2003.11.24 0 Free iconectiv manages the Number Portability Administration Center (NPAC), the largest number portability system in the world. Consisting of seven regional systems, the NPAC facilitates number porting across all Service Providers in the United States.

  6. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    SIM locking curbs this by prohibiting change of network (using a new SIM). In some countries, SIM locking is very common if subsidized phones are sold with prepaid contracts. It is important to note, however, that the technology associated with the phone must be compatible with the technology being used by the network carrier.

  7. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  8. International Mobile Equipment Identity - Wikipedia

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

    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.

  9. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    A typical SIM card (mini-SIM with micro-SIM cutout) A SIM (Subscriber Identity Module) card 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).