Network connectivity
Adding Wi-Fi networks
If the desired network does not appear in the networks list, tap Add Wi-Fi network at the bottom of the networks list. Enter the network name in Network SSID, select the security type and enter the password if it is not an open network, and then tap CONNECT.
Activating Wi-Fi Passpoint
Wi-Fi Passpoint enables the device to search for and connect to a certified Wi-Fi network. You can use the Passpoint feature to connect to public Wi-Fi networks that support automated authentication. When you move to a new location, it will search for and connect to another certified Wi-Fi network.
This feature may not be available depending on the region.
Tap 
→Advanced, and then tick Passpoint.
Forgetting Wi-Fi networks
Any network that has ever been used, including the current network, can be forgotten so the device will not automatically connect to it. Select the network in the networks list and tap
FORGET.
Using Smart network switch
Use this feature to maintain a stable network connection when you browse webpages, download content, and more.
On the Apps screen, tap Settings →Wi-Fi, and then tick Smart network switch. The device automatically switches from a Wi-Fi network to a mobile network when the current Wi-Fi network is weak or unstable. When the Wi-Fi network signal becomes strong, the device switches from the mobile network back to the Wi-Fi network.