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2. Videotelephony - Wikipedia

   en.wikipedia.org/wiki/Videotelephony

   Videotelephony (also known as videoconferencing or video call) is the use of audio and video for simultaneous two-way communication. [1] There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone). In the present day, devices like smartphones and computers are capable of video ...

3. Google Duo - Wikipedia

   en.wikipedia.org/wiki/Google_Duo

   Video chat mobile app. Website. duo.google.com. Google Duo is a discontinued proprietary voice over IP (VoIP) and videotelephony service released in 2016 by Google and merged into its Google Meet product in 2022. It was available for Android, IOS and web browsers.

4. 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.

5. Skype - Wikipedia

   en.wikipedia.org/wiki/Skype

   Skype allows these registered users to communicate through both instant messaging and voice chat. Voice chat allows telephone calls between pairs of users and conference calling and uses proprietary audio codec. Skype's text chat client allows group chats, emoticons, storing chat history, and editing of previous messages. Offline messages were ...

6. FaceTime - Wikipedia

   en.wikipedia.org/wiki/FaceTime

   t. e. FaceTime is a proprietary videotelephony product developed by Apple Inc. FaceTime is available on supported iOS mobile devices running iOS 4 and later and Mac computers that run Mac OS X 10.6.6 and later. FaceTime supports any iOS device with a forward-facing camera and any Mac computer equipped with a FaceTime Camera.

7. Comparison of cross-platform instant messaging clients

   en.wikipedia.org/wiki/Comparison_of_cross...

   Google Chat: Email; Google account Yes Google Messages (RCS) Phone number Similar to SMS requirements, RCS messaging requires a valid SIM card to be inserted in the device. RCS chat features may continue to work for up to 14 days, when a SIM card is removed from the device. [108] Yes, only for RCS chats — [clarification needed] Yes ICQ: Phone ...