Lumia 1520 – Close all internet connections
Save your battery by closing internet connections that are open in the background. You can do it without closing any apps.
- On the start screen, swipe left, and tap
Settings > WiFi. - Switch WiFi networking to Off
.
Close a mobile data connection
On the start screen, swipe left, and tap Settings > mobile network, and switch Data connection to off .
Click here for Complete Details of Lumia 1520 Internet
Short Trick 