Samsung Galaxy A8 2018
Android 7.1
1 Find "Wi-Fi"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Connections.
Press Wi-Fi.
2 Turn on Wi-Fi
Press the indicator to turn on the function.
3 Turn automatic use of mobile data on or off
Press ADVANCED.
Press the indicator next to "Adaptive Wi-Fi" to turn the function on or off.
4 Return to the home screen
Press the Home key to return to the home screen.