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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 your finger downwards starting from the top of the screen.
Press the settings icon.
Press the settings icon at 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
Press the Home key to return to the home screen.