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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 indicator next to "Wi-Fi" 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.