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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 your finger downwards starting from the top of the screen.
Press the settings icon.
2. Turn automatic use of mobile data on or off
Press Smart network switch.
If you want to turn on the function, press On.
If you want to turn off the function, press Off.
3. Return to the home screen
Press the Home key to return to the home screen.