iOS: Go to the App Store® and select Search from the bottom menu. Type “Wear OS by Google” in the search bar, select the Wear OS by Google App, and tap Get. Wait for the app to download to your phone.
ANDROID: Go to the Google Play™ store, type Wear OS by Google in the search bar, select the Wear OS by Google App, and tap Install. Wait for the app to download to your phone.