Samsung Galaxy A5 (2017)
Android 6.0
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 automatic use of mobile data on or off
Press ADVANCED.
Press the indicator next to "Smart network switch" to turn the function on or off.
3 Return to the home screen
Press the Home key to return to the home screen.