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You can set your phone to use mobile data automatically when the connection to the Wi-Fi network is weak. To turn automatic use of mobile data on or off, you need to turn on 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 to turn on the function.
3. Turn automatic use of mobile data on or off
Press Wi-Fi preferences.
Press the indicator next to "Turn on Wi-Fi automatically" to turn the function on or off.
4. Return to the home screen
Press the Home key to return to the home screen.