The Control Center is one of the new features I loved the most in iOS 7 that lets you easily toggle on and off certain settings, such as Air mode, WiFi, Bluetooth, ect., even when you are in the lock mode.
On iOS 7 lock screen, you will see a short white bar sitting in the bottom of the screen.
Swiping up your finger through this white bar will activate the new Control Center right away.
And, you can do the same to activate it when you are in home screen, or even in the app. That gives you the easy access to the control center wherever you are with your phone.