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2. History of videotelephony - Wikipedia

   en.wikipedia.org/wiki/History_of_videotelephony

   By 1930, AT&T's "two-way television-telephone" system was in full-scale experimental use. [7] [20] The Bell Labs' Manhattan facility devoted years of research to it during the 1930s, led by Dr. Herbert Ives along with his team of more than 200 scientists, engineers and technicians, intending to develop it for both telecommunication and broadcast entertainment purposes.

3. Videotelephony - Wikipedia

   en.wikipedia.org/wiki/Videotelephony

   Videophones are standalone devices for video calling (compare Telephone). In the present day, devices like smartphones and computers are capable of video calling, reducing the demand for separate videophones. Videoconferencing implies group communication. [2] Videoconferencing is used in telepresence, whose goal is to create the illusion that ...

4. Voice over LTE - Wikipedia

   en.wikipedia.org/wiki/Voice_over_LTE

   VoLTE calling. Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [1][2] VoLTE has up to three times more voice and data capacity than older 3G UMTS and up to six times more than 2G GSM. It uses less bandwidth because VoLTE's packet ...

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

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

   The telephone played a major communications role in American history from the 1876 publication of its first patent by Alexander Graham Bell onward. In the 20th century the American Telephone and Telegraph Company (AT&T) dominated the telecommunication market as the at times largest company in the world, until it was broken up and replaced by a system of competitors.

6. MCI Communications - Wikipedia

   en.wikipedia.org/wiki/MCI_Communications

   MCI Communications Corporation (originally Microwave Communications, Inc.) was a telecommunications company headquartered in Washington, D.C. that was at one point the second-largest long-distance provider in the United States. MCI was instrumental in legal and regulatory changes that led to the breakup of the Bell System and introduced ...

7. Wi-Fi calling - Wikipedia

   en.wikipedia.org/wiki/Wi-fi_calling

   Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet, while ...