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  1. 9-1-1 is an emergency telephone number used in many countries in the Americas A fire truck in Ennigerloh , Germany, with the European emergency number 1-1-2 painted on its side In many countries, dialing either 1-1-2 (used in Europe and parts of Asia) or 9-1-1 (used in the Americas) will connect callers to the local emergency services .

  2. A telephone exchange, telephone switch, or central office is a telecommunications system used in the public switched telephone network (PSTN) or in large enterprises. It interconnects telephone subscriber lines or virtual circuits of digital systems to establish telephone calls between subscribers.

  3. Telephone tapping (also wire tapping or wiretapping in American English) is the monitoring of telephone and Internet-based conversations by a third party, often by covert means. The wire tap received its name because, historically, the monitoring connection was an actual electrical tap on the telephone line.

  4. Because numbers were different for every exchange, callers either had to dial the operator or look up the telephone number. An example of this was Auckland , New Zealand , before the introduction of 111 in the 1960s – the city had 40 exchanges, all with different emergency numbers, and finding the telephone number for the local exchange would ...

  5. Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.

  6. Amy Phillips from Pitchfork Media placed "Telephone" at number 55 in her list "Top Tracks of 2010", noting that it was "one of the less weird tracks" on The Fame Monster. The same year, the song was also included on year-end lists of best songs compiled by MTV News and PopMatters at numbers ten and 29 respectively.

  7. Ofcom has also reserved certain number ranges for use in television dramas and films, so as to avoid the risk of people having their telephone numbers displayed and receiving unwanted calls. This is similar to the use of fictitious telephone numbers in the United States and Canada starting with the digits 555.

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