You can set your mobile phone to use mobile data automatically when the connection to the Wi-Fi network is weak. Before you can turn automatic use of mobile data on or off, you need to turn on mobile data.
Step 1 of 7
Find "Wi-Fi"
Slide your finger downwards starting from the top of the screen.
Step 2 of 7
Find "Wi-Fi"
Tap the settings icon.
Step 3 of 7
Find "Wi-Fi"
Tap Connections.
Step 4 of 7
Find "Wi-Fi"
Tap Wi-Fi.
Step 5 of 7
Turn automatic use of mobile data on or off
Tap ADVANCED.
Step 6 of 7
Turn automatic use of mobile data on or off
Tap the indicator next to "Adaptive Wi-Fi" to turn the function on or off.