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  2. PhONEday - Wikipedia

    en.wikipedia.org/wiki/PhONEday

    PhONEday had cleared area codes from 02 to 09 of all geographic allocations by converting 9-digit numbers to 10-digit 01 numbers (and, in parts of at least 47 area codes, 8-digit numbers to 9-digit 01 numbers). After PhONEday, all pre-existing 9-digit mobile, non-geographic, premium rate, personal and pager numbers from 02 to 09 remained in place.

  3. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    Code Countries Allocated use 0000 Europe: Non-discrete mode A code; shall not be used. [1]UK: Mode C or other SSR failure [2]: US: Should never be assigned. [3]Military intercept code.

  4. 0151 - Wikipedia

    en.wikipedia.org/wiki/0151

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  5. History of telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/History_of_telephone...

    The remainder of the "mixed" area code allocations and their history are detailed in the table below. Of the 11 area codes freed up for alternative use in the 1980s, only 5 were actually re-used for other services. For example, the 0541 area code was re-allocated to C&WC Area Call services. Six of the area codes remained unused.

  6. Telephone numbers in Germany - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Germany

    Geographic numbers in the New States were assigned area codes starting with 3, in some cases followed by the former East German area code (without the initial 0) or a code similar to it. Thus, Leipzig , for example, which had used East German domestic area code 41, was assigned the new area code 341 in the unified telephone system.

  7. List of dialling codes in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/List_of_dialling_codes_in...

    This list is based on the official standard, but includes defunct codes and historical changes, including the derivation of the two letter identities, in cases where known. [ 1 ] [ 2 ] [ 3 ] Dialling codes do not correspond to specific political boundaries: for example, the Coventry dialling code covers a large area of Warwickshire and the ...

  8. Big Number Change - Wikipedia

    en.wikipedia.org/wiki/Big_Number_Change

    Some widespread misunderstandings about area codes came about with the Big Number Change, most notably with London area codes. There is a widespread but erroneous assumption that London has several area codes – 0203, 0204, 0207 and 0208 – whereas, in fact, it has just one: 020. Similar misunderstandings came about with a few other area codes.

  9. 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 ...