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  2. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. It is designed to reproduce speech of a quality that is understandable. [1] It is the physical wire or other signaling medium connecting the user's telephone apparatus to the telecommunications network, and ...

  3. History of the telephone - Wikipedia

    en.wikipedia.org/wiki/History_of_the_telephone

    Previous telephones required the user to operate a separate switch to connect either the voice or the bell. With the new kind, the user was less likely to leave the phone "off the hook". In phones connected to magneto exchanges, the bell, induction coil, battery, and magneto were in a separate bell box called a "ringer box." In phones connected ...

  4. Telephone - Wikipedia

    en.wikipedia.org/wiki/Telephone

    An old rotary dial telephone. AT&T push button telephone made by Western Electric, model 2500 DMG black, 1980. A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice ...

  5. Push-button telephone - Wikipedia

    en.wikipedia.org/wiki/Push-button_telephone

    A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field ...

  6. Smartphone - Wikipedia

    en.wikipedia.org/wiki/Smartphone

    A smartphone (often simply called a phone) is a mobile device that combines the functionality of a traditional mobile phone with advanced computing capabilities. It typically has a touchscreen interface, allowing users to access a wide range of applications and services, such as web browsing, email, and social media, as well as multimedia ...

  7. Hotline - Wikipedia

    en.wikipedia.org/wiki/Hotline

    However, in common or colloquial usage, a "hotline" often refers to a call center reachable by dialing a standard telephone number, or sometimes the phone numbers themselves. This is especially the case with 24-hour, noncommercial numbers, such as police tip hotlines or suicide crisis hotlines, which are staffed around the clock and thereby ...

  8. Public switched telephone network - Wikipedia

    en.wikipedia.org/wiki/Public_switched_telephone...

    Public switched telephone network. The public switched telephone network ( PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber-optic cables, microwave transmission ...

  9. Satellite phone - Wikipedia

    en.wikipedia.org/wiki/Satellite_phone

    Satellite phone ( Inmarsat) in use in Nias, Indonesia, in April 2005 after the Nias–Simeulue earthquake. A satellite telephone, satellite phone or satphone is a type of mobile phone that connects to other phones or the telephone network by radio link through satellites orbiting the Earth instead of terrestrial cell sites, as cellphones do.

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