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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. Turn Wi-Fi on or off
Slide two fingers downwards starting from the top of the screen.
Press the Wi-Fi icon to turn the function on or off.
2. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.