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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.
Disable auto app updates; manually update at your convenience
iOS 7 will now update your apps and music in the background. If you're connected to Wi-Fi networks (or the cellular network), your apps will remain up to date without bugging you. But this consumes data and power, and should be restricted for when you're free to plug in your iPhone to charge.
Tap the Settings icon, scroll down to iTunes & App Store and turn off the Updates and Apps settings. Another quick power (and data) saving tip: You can allow updates when you're on Wi-Fi only by deselecting Use Cellular Data at the same time.
Block persistent callers from contacting you
Calls significantly drain your battery meter, even if you don't pick up incoming calls. If you get the same persistent person calling, you can now block them from reaching you.
To do this, head back to Settings and scroll down to Phone. Scroll down further to Blocked and select the contacts you wish to automatically refuse access. While this feature blocks the call coming through, it doesn't prevent the caller from leaving you a voicemail.