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You can add new functions to your Apple Watch by installing apps from App Store.
On your phone: Press Watch.
On your phone: Press Discover.
On your phone: Press Explore Watch Apps.
On your phone: Go to the required app.
On your phone: Press the required app.
On your phone: Press Get and follow the instructions on the screen to install the app.
If you've selected a paid app, press the price to install the app.
