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You can use Wi-Fi as an alternative to the mobile network when establishing an internet connection. This way your phone doesn't use mobile data.
1. Find "Wi-Fi"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network & Internet.
2. Turn on Wi-Fi.
Press the indicator next to "Use Wi-Fi" to turn on the function.
3. Connect to a Wi-Fi network
Press the required Wi-Fi network.
Key in the password for the Wi-Fi network and press Connect.
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.
4. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.