The interchangeable "Hey Google" or "OK Google" voice commands trigger Google Assistant work on Android and iOS devices.
How to Set Up 'OK Google' on iOS and Android
How to change your mobile operating system
How to Set Up 'OK Google' on iOS and Android
Change Settings in the Assistant App, Google Assistant SDK
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How to Set Up 'OK Google' on iOS and Android
How to Set Up 'OK Google' on iOS and Android? - GeeksforGeeks
Google's iPhone app for wirelessly switching to Android will be ready for Pixel owners in a few weeks - The Verge
How to setup your new phone for iOS and Android