Save on mobile data by connecting to WiFi. Here's how:
Go to the Start screen. Drag the bar up to the edge of the screen.
Tap Settings.
Tap Network and Internet.
Tap Wi-Fi.
Enable Wi-Fi.
All available wireless networks within range of your phone will be listed.
Tap the network to which you want to connect.
If the network is not listed, make sure that the network is enabled and within range of your phone.
Enter your WiFi password and tap CONNECT.
Your phone will now be connected to the WiFi network.