Google says that the feature is available on all Pixel phones in 43 U.S. states and that it will be coming to "more Android and iOS devices" over the course of the next few weeks.
Unveiled at the 2018 Google I/O developer conference, Google Duplex lets Google Assistant make calls to businesses to schedule appointments and make restaurant reservations. It was demoed on stage with Google Assistant making a phone call to a real salon and using a natural-sounding conversation to book an appointment.
Following the demo, there were questions about the ethics of having a machine phone a real person, but in response, Google said that Google Assistant will identify itself and will allow restaurants to opt out of being recorded.
Placing a restaurant reservation this way involves telling Google Assistant where you want to go, what time, and with how many people. Google Assistant then calls the restaurant, and once a reservation is made successfully, you're notified via email and calendar invite.