The handy Control Center in iOS 7 makes popular settings accessible via the Home screen: Swipe up from the bottom of the screen to turn on (or off) Airplane Mode, Bluetooth, Do Not Disturb and Wi-Fi. You can adjust other settings too, including volume and brightness. There's a potential security risk here, however, as Control Center is accessible from the lock screen by default. If you travel a lot or use your iOS device in public places, a thief could swipe your device and use Control Center to enable Airplane Mode, which renders the Find My iPhone recovery tool useless. If you value safety over convenience, go to Settings/Control Center and turn off "Access on Lock Screen."