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  2. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    Google Voice currently provides free PC-to-phone calling within the United States and Canada, and PC-to-PC voice and video calling worldwide between users of the Google+ Hangouts browser plugin (available for Windows, Intel-based Mac OS X, and Linux). [ 5] Almost all domestic and outbound calls to the United States (including Alaska and Hawaii ...

  3. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Phreaking began in the 1960s when it was discovered that certain whistles could replicate the 2600 Hz pitch used in phone signalling systems in the United States. [3] Phone phreaks experimented with dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure ...

  4. History of the telephone in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_the_telephone...

    By mid-century, mobile radio telephone service became available to free users from fixed locations in some cities. The arrival of the smartphone in the early 21st century provided every user a small mobile computer with microphone and speaker, that was bundled with powerful features, such as cameras and Internet access by operation of apps. It ...

  5. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.

  6. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party . Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone ...

  7. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Some are not accessible from pay phones. Calls from pay phones assess the toll-free owner an additional fee in the U.S., as mandated by the FCC. Although toll-free numbers are not accessible internationally, many phone services actually call through the U.S., and in this case the toll-free numbers become available.

  8. Windows Live Call - Wikipedia

    en.wikipedia.org/wiki/Windows_Live_Call

    Windows Live Call was part of Microsoft 's Windows Live services. It integrated into Windows Live Messenger to allow users to make PC-to-PC and PC-to-Phone voice and video calls. Microsoft partnered with telecommunication companies around the world to allow users to use a PC equipped with a microphone and speakers and a high speed Internet ...

  9. Party line (telephony) - Wikipedia

    en.wikipedia.org/wiki/Party_line_(telephony)

    A party line ( multiparty line, shared service line, party wire) is a local loop telephone circuit that is shared by multiple telephone service subscribers. [ 1][ 2][ 3] Party line systems were widely used to provide telephone service, starting with the first commercial switchboards in 1878. [ 4] A majority of Bell System subscribers in the mid ...

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