If a person in the Contacts application on iOS cannot be found in one of Apple 's services, the application will try to use Google Hangouts if the person has a Gmail address. This can be seen in the Call and Video buttons under the contact's name. Version 16.0.0 of the application saw the ability to use the system's phone application to send and receive calls. This integration is most certainly the source for this ability. This contact only has a phone number and it's not associated with any Apple services. But it's known to Hangouts, so the video call button is labeled "Hangouts."
A little commentary about the world of
technology and programming. No "holy wars,"
or ideological rants, just posts about tech
news and other findings from around various
places.