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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).

  3. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    By re-creating these tones, phreaks could switch calls from the phone handset, allowing free calls to be made around the world. To ease the creation of these tones, electronic tone generators known as blue boxes became a staple of the phreaker community.

  4. John Draper - Wikipedia

    en.wikipedia.org/wiki/John_Draper

    The group had previously used an organ and cassette recordings of tones to make free calls. Among the phone phreaks, one blind boy who had taken the moniker of Joybubbles had perfect pitch and was able to identify frequencies precisely.

  5. Make Free Calls and Reduce Your Cell Phone Plan - AOL

    www.aol.com/news/2014-01-23-free-phone-calls...

    You might be paying for cell phone minutes you don't need. By the same token, if you're exceeding your monthly plan, overtime minutes don't come cheap. Here's how to save on phone calls.

  6. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    Armed with records of all long-distance calls made, kept by both mechanical switching systems and newer electronic switching systems, including calls to toll-free telephone numbers which did not appear on customer bills, telephone security employees began examining those records looking for suspicious patterns of activity. For instance, at the ...

  7. Textfree - Wikipedia

    en.wikipedia.org/wiki/Textfree

    textfree .us. TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying ...

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