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  2. 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.

  3. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone 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 ...

  4. 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 ...

  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. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    USSD on a Sony Ericsson mobile phone (2005). Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.

  7. MSISDN - Wikipedia

    en.wikipedia.org/wiki/MSISDN

    MSISDN (/ ˈ ɛ m ɛ s aɪ ɛ s d iː ɛ n / MISS-den) is a number uniquely identifying a subscription in a Global System for Mobile communications or a Universal Mobile Telecommunications System mobile network. It is the mapping of the telephone number to the subscriber identity module in a mobile or cellular phone.

  8. AOL Help

    help.aol.com

    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  9. International mobile subscriber identity - Wikipedia

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

    For GSM, UMTS and LTE networks, this number was provisioned in the SIM card and for cdmaOne and CDMA2000 networks, in the phone directly or in the R-UIM card (the CDMA equivalent of the SIM card). Both cards have been superseded by the UICC. An IMSI is usually presented as a 15-digit number but can be shorter.