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  2. Fixed Dialing Number - Wikipedia

    en.wikipedia.org/wiki/Fixed_dialing_number

    Fixed Dialing Number (FDN) is a service mode of a GSM mobile phone's SIM card. [1] Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. [1] A notable exception is that emergency calls to 000, 112, 911, 999 and the like are exempt. [2]

  3. GSM services - Wikipedia

    en.wikipedia.org/wiki/GSM_services

    The current cellular location of the phone (i.e., which BTS it is at) is entered into the VLR record and will be used during a process called paging when the GSM network wishes to locate the mobile phone. Every SIM card contains a secret key, called the Ki, which is used to provide authentication and encryption services.

  4. 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.

  5. 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 ...

  6. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    Ofcom, UK's telecom regulator, allowed 3 to sell a mobile phone with the SIM card permanently superglued to the phone. [66] Most operators offer some form of unlocking service, depending on the state of the contract and the model of phone, but usually for a charge.

  7. 'No excuse,' mayor says, for Helene victims to be isolated ...

    www.aol.com/deep-frustration-cell-phone-outages...

    When Helene inundated and isolated communities across the Southeast, it knocked out cell phone service in Canton, North Carolina at the moment residents needed it most, according to the town's ...

  8. The Best Cheap Cell Phone Plans for 2022 - AOL

    www.aol.com/best-cheap-cell-phone-plans...

    The current cheapest cell phone plans are Tello 1GB, Mint Mobile 4GB and T-Mobile 3GB, but also double check what new deals are coming out as well as if the carrier has changed any details within ...

  9. Quickly find your lost cellphone - AOL

    www.aol.com/article/2015/12/29/quickly-find-your...

    Panic sets in fast if you don't have a landline phone to call your cellphone, and almost half of homes don't. There is a simple and quick solution to find your phone, though. There is a simple and ...