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  2. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the countryv—AT&T Mobility, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  3. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    A telepresence system in 2007. Videotelephony (also known as videoconferencing or video call) is the use of audio and video for simultaneous two-way communication. [1] Today, videotelephony is widespread. There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone).

  4. Comparison of VoIP software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_VoIP_software

    This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e.g., have a PSTN phone number in a New York ...

  5. eVoice - Wikipedia

    en.wikipedia.org/wiki/EVoice

    eVoice is a telecommunications service owned by j2 Global, Inc. (NASDAQ:JCOM). The company manages incoming and outgoing calls using virtual phone numbers. [1] The service was initially founded by Wendell Brown, Mark Klein, and Craig Taro Gold in 2000 and re-launched in March 2010 with an expansion of services that include both individual, personal uses as well as services for businesses.

  6. Ooma - Wikipedia

    en.wikipedia.org/wiki/Ooma

    Ooma was founded by Andrew Frame, who previously worked for Cisco Systems, and Michael Cerda. [5][6] Ooma's initial product was a "VoIP in a box" device that used peer-to-peer VoIP technology to let users make phone calls over other Ooma users' landline services. [7][8] The system worked through a "hub" connected to the main phone line and ...

  7. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    The susceptibility of phone service to power failures is a common problem even with traditional analog service where customers purchase telephone units that operate with wireless handsets to a base station, or that have other modern phone features, such as built-in voicemail or phone book features.

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