The exact number of US cities where the functionality is reaching iOS users remains undisclosed. Google CEO Sundar Pichai introduced Duplex earlier this week in the company’s annual developer’s conference Google I/O and demonstrated how the AI system could book an appointment at a salon and a table at a restaurant. In the demo, the Google Assistant sounded like a real person that led to an outcry over the ethical dilemmas raised by tech critics. Google, however, confirmed later that the system would have a “disclosure built-in” and Duplex would identify itself during interactions. The status of a wider roll-out of Duplex to non-Pixel Android users also remains unclear as of now.