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  2. Tesco Mobile - Wikipedia

    en.wikipedia.org/wiki/Tesco_Mobile

    Tesco Mobile was established in May 2003 [4] and launched pre-paid mobile services in Tesco stores and online by the end of the year. [5] In January 2014, the network in the United Kingdom started offering 4G service, for its pay monthly and SIM only customers at no extra cost, extending the service to pay as you go customers in July of that year.

  3. List of mobile virtual network operators in the United Kingdom

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

    Brand Host network Defunct date Notes AfriMobile: Three: 13 October 2020: Dissolved 13 October 2020 Andrews & Arnold: Three: 30 April 2013 [35]: Ceased operations when their upstream partner "pulled the plug". [36]

  4. Unstructured Supplementary Service Data - Wikipedia

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

    On some pay as you go networks, such as Tesco Mobile, once a user performs an action that costs money, the user sees a USSD message with their new balance. USSD can also be used to refill the balance on the user's SIM card and to deliver one-time passwords or PIN codes.

  5. Telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    Although some mobile phones allow emergency calls to be attempted without a SIM card, at present the UK networks reject such calls. Since November 2009, an emergency call can be made through any UK mobile network as long as there is a SIM for any valid UK network in the handset.

  6. 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).

  7. Three UK - Wikipedia

    en.wikipedia.org/wiki/Three_UK

    The network provides LTE and DC-HSDPA service as a standard feature to all its subscribers using "Ultrafast" to describe both technologies, making it (at the time) the cheapest price for 4G and the only unlimited 4G in the UK. [37] [38] In April 2015, Three announced that VoLTE would be rolled out along with 800 MHz spectrum from September. [39]

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