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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. 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 ...

  4. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Phreaking is a slang term coined to describe the activity of a culture of people who study, experiment with, or explore telecommunication systems, such as equipment and systems connected to public telephone networks. [1] The term phreak is a sensational spelling of the word freak with the ph- from phone, and may also refer to the use of various ...

  5. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Voice over Internet Protocol ( VoIP [a] ), also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to ...

  6. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    Blue box designed and built by Steve Wozniak and sold by Steve Jobs before they founded Apple. Displayed at the Powerhouse Museum, from the collection of the Computer History Museum [1] A blue box is an electronic device that produces tones used to generate the in-band signaling tones formerly used within the North American long-distance ...

  7. Pinger - Wikipedia

    en.wikipedia.org/wiki/Pinger

    Textfree is an app that allows user to call and text using a real phone number for free. The app has a free ad-supported version and a paid version. The app allows you to text anyone in the world. Sideline. Sideline is an app that adds a second phone number to your phone using technology similar to Textfree.

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