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IP Relay
IP Relay was first introduced as a means of communication for the Deaf community by Sorenson Communications -
"Sidekick"
“Sidekick” phone was the first cell phone to include instant messaging along with on-device email and a full QWERTY keyboard. http://www.complex.com/pop-culture/2015/09/history-of-the-sidekick -
Skype
Skype was invented, by Priit Kasesalu and Jaan Tallinn, as a online video calling service. https://www.youtube.com/watch?v=7AuhjzxAudY -
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Apple's iPhone
First generation of Apple’s iPhone comes out. https://www.imore.com/history-iphone-original -
Facetime
Facetime was added to the new iOS 9.3 update for iPhone users.
