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You can use Wi-Fi as an alternative to the mobile network when establishing an internet connection. This way your Apple Watch doesn't use mobile data.
1. Find "Wi-Fi"
Press the Digital Crown.
Press the settings icon.
2. Turn on Wi-Fi
Press the indicator next to "Wi-Fi" to turn on the function.
3. Connect to a Wi-Fi network
Press the required Wi-Fi network.
If the Wi-Fi network is password protected, a lock icon is displayed next to the name of the Wi-Fi network. You can get the password from the network provider or administrator.
Press the required setting.
Key in the password for the Wi-Fi network and press Join.
4. Return to the home screen
Press the Digital Crown to return to the home screen.