Huawei P40 Pro
Select help topic
Turning automatic use of mobile data on or off
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.
Press Settings.
Press Wi-Fi.
Press the indicator next to "Wi-Fi" to turn on the function.
Press More settings.
Press the indicator next to "Wi-Fi+" to turn the function on or off.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.