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  2. 1-5-7-1 - Wikipedia

    en.wikipedia.org/wiki/1-5-7-1

    In 2001, BT Group launched its Answer 1571 service as a free service, available at no extra cost to its existing telephone line customers. In 2007 a charge of £1 was introduced for any month in which two chargeable calls are not made on the line (this might apply, for instance, to people who have Carrier preselect with another telephone ...

  3. Plant test number - Wikipedia

    en.wikipedia.org/wiki/Plant_test_number

    In telecommunications, a plant test number is a telephone number reserved for use by telephone installers or other workers to test an individual telephone line. Test numbers are typically unlisted. The North American Numbering Plan (NANP) reserves the exchange (central office) prefixes 958 and 959 for plant testing. [1]

  4. Telephone numbers in the United Kingdom - Wikipedia

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

    07xxx xxx xxx—mobile phones and WiFi numbers. Individual mobile phone companies are allocated different ranges within the 073xx, 074xx, 075xx, 07624, 077xx, 078xx and 079xx area codes. Changes to mobile phone numbers in the Big Number Change were mostly straight replacements, such as Vodafone customers on the 0378 block became 07778.

  5. Line hunting - Wikipedia

    en.wikipedia.org/wiki/Line_hunting

    Multiline hunting (sometimes MLH, line hunting or MHG, multiline hunting group) is a feature that allows multiple telephone lines going into a business to act as a single group, called a hunt group. This type of fallback is a somewhat more complex form of call forwarding. If the line called is busy, the call goes to the next available line.

  6. Directory assistance - Wikipedia

    en.wikipedia.org/wiki/Directory_assistance

    [6] 118 118 (The Number) was the second most-expensive number at £11.23 for a 90-second call, but accounted for 40% of DQ calls, [4] mostly due to heavy advertising. Until 23 August 2003 directory inquiries were available by dialing 192 for numbers in Britain, and 153 for foreign numbers, with the service supplied by the caller's telephone ...

  7. Last-call return - Wikipedia

    en.wikipedia.org/wiki/Last-call_return

    The number for this facility varies with country and provider: United States and Canada: Vertical service code *69; 1169 on rotary phone/pulse dial telephones. The prompt voice behind most U.S. AT&T implementations of this feature is Pat Fleet. Where available, it is offered on a per-call charge (typically 50¢) or an unlimited-use monthly ...

  8. Mercury Communications - Wikipedia

    en.wikipedia.org/wiki/Mercury_Communications

    Mercury began by offering fixed-line facilities direct to business and residential customers. Callers could use the 'Mercury 2300' service via their existing BT phone line by dialling a '131' prefix followed by a ten-digit customer code, then the number they wished to dial. Some phones were manufactured with a 'Mercury button' which allowed the ...

  9. Digital access carrier system - Wikipedia

    en.wikipedia.org/wiki/Digital_Access_Carrier_System

    The first subscriber's phone (called the 'audio customer') would be connected as normal. The second subscriber (called the 'carrier customer') would have his phone calls modulated on to an RF carrier or Carrier wave on the same physical phone line at around 40 kHz – high enough not to be noticeable to the audio customer.