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Limit apps from churning up data, power in the background
You can now limit which dormant apps download data, and therefore consume power, in the background. For instance, while it may be useful for a mapping app to provide you with up-to-the-minute turn-by-turn directions on the road, you may not want other apps, such as the Stocks app, to update if you're not particularly interested in the financial market.
To change this setting, tap through to Settings > General > Background App Refresh, then deselect apps that you do not want to update in the background when they're not in use.