Nokia Lumia 820 - Manual (Page 86)

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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.
1. On the start screen, swipe left, and tap Settings > Wi-Fi.
2. Switch Wi-Fi networking to Off .
Close a mobile data connection
On the start screen, swipe left, tap Settings > cellular, and switch Data connection to off.
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