Google Duplex was one of the interesting artificial intelligence capabilities demonstrated by Google back at its I/O conference in May 2018, what with its natural-sounding voice as it speaks with a restaurant receptionist to make a reservation for you. However, it wasn't until late last year that the service became available initially on Pixel 3 smartphones, albeit in a limited capacity.
First, it was available only in four cities, and while the expansion had been quite slow, Duplex finally expanded to 43 additional U.S. states last month. Now, in addition to its wider regional availability, Duplex has also gone live on other Android smartphones beyond the Pixel 3 series as well as on iOS devices.
The updated support page for Google Assistant indicates that customers can use Duplex on Android devices running version 5.0 or later and iPhones with the Assistant onboard. XDA Developers also confirmed that it's now available on the Samsung Galaxy S10+. Duplex's real-world capability is shown in the video demonstration below:
For now, Duplex's capability is practically limited only to booking a reservation for you, but as it expands in availability, it could also grow its capabilities.
Source: XDA Developers