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  2. Postpaid mobile phone - Wikipedia

    en.wikipedia.org/wiki/Postpaid_mobile_phone

    Postpaid service mobile phone typically requires two essential components in order to make the 'post-usage' model viable: Credit history/Contractual commitment. This is the basis on which the service provider is able to trust the customer with paying their bill when it is due and to have legal recourse in case of non-payment; Service tenure.

  3. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

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

  4. Universal integrated circuit card - Wikipedia

    en.wikipedia.org/wiki/Universal_integrated...

    In 2G networks, the SIM card and SIM application were bound together, so that "SIM card" could mean the physical card, or any physical card with the SIM application. In a GSM network, the UICC contains a SIM application and in a UMTS network, it contains a USIM application. A UICC may contain several applications, making it possible for the ...

  5. 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.

  6. GSM services - Wikipedia

    en.wikipedia.org/wiki/GSM_services

    Once the SIM card is loaded into the phone and the phone is powered on, it will search for the nearest mobile phone mast (also called a Base Transceiver Station/BTS) with the strongest signal in the operator's frequency band. If a mast can be successfully contacted, then there is said to be coverage in the area. The phone then identifies itself ...

  7. Type Allocation Code - Wikipedia

    en.wikipedia.org/wiki/Type_Allocation_Code

    The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.

  8. Textfree - Wikipedia

    en.wikipedia.org/wiki/Textfree

    TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ad-free ...

  9. PC Mobile - Wikipedia

    en.wikipedia.org/wiki/PC_Mobile

    PC Mobile is a licensed white label prepaid wireless service operated in Canada. Its mobile telephone products and services operate on the network infrastructure operated by Bell Mobility and formerly Telus Mobility (the two companies managed one of the service types each with Telus discontinuing the postpaid service in October 2018), but licensed the proprietary branding and payment media ...