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  2. International mobile subscriber identity - Wikipedia

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

    The IMSI is used in any mobile network that interconnects with other networks. 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 Both cards have been superseded by the UICC.

  3. 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).

  4. International Mobile Equipment Identity - Wikipedia

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

    IMEI number - an example. The International Mobile Equipment Identity ( IMEI) [1] is a numeric identifier, usually unique, [2] [3] for 3GPP and iDEN mobile phones, as well as some satellite phones. It is usually found printed inside the battery compartment of the phone but can also be displayed on-screen on most phones by entering the MMI ...

  5. Emergency telephone number - Wikipedia

    en.wikipedia.org/wiki/Emergency_telephone_number

    Most GSM mobile phones can dial emergency numbers even when the phone keyboard is locked, the phone is without a SIM card, emergency number is entered instead of the PIN or there is not a network signal (busy network). Most GSM mobile phones have 112, 999 and 911 as pre-programmed emergency numbers that are always available.

  6. Cell Broadcast - Wikipedia

    en.wikipedia.org/wiki/Cell_Broadcast

    Cell Broadcast ( CB) is a method of sending messages to multiple mobile telephone users in a defined area at the same time. It is defined by the ETSI 's GSM committee and 3GPP and is part of the 2G, 3G, 4G LTE (telecommunication) and 5G standards. [1] It is also known as Short Message Service -Cell Broadcast (SMS-CB) or CB SMS.

  7. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    Overview. Mobile number portability is implemented in varying ways across the globe. The international and European standard implements "recipient-led" porting, in which a customer wishing to port a telephone number contacts the new network (recipient), which sends the number portability request (NPR) to the current network operator (donor).

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