Save your battery by closing internet connections that are open in the background. You can do it without closing any apps.
Tap Settings > Wi-Fi.
Switch Wi-Fi to Off.
Close a cellular data connection
Swipe down from the top of the screen.
Switch Cellular data to Off.
Turn on airplane mode
Tap Settings > More.
Switch on Airplane mode.
Airplane mode closes connections to the cellular network and switches your device’s wireless features off. Comply with the instructions and safety requirements given by, for example, an airline, and any applicable laws and regulations. Where allowed, you can connect to a Wi-Fi network to, for example, browse the internet or switch Bluetooth sharing on in airplane mode.