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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 the screen.
Press the settings icon.
2. Turn Wi-Fi on or off
Press the indicator next to "Wi-Fi" to turn the function on or off.
3. Return to the home screen
Press the Home key to return to the home screen.