How the Notification bar works
The notification bar is located at the top of all your home screens, and it’s the place your applications, and message services can drop you a note that there’s something new to look at!
The notification bar is also where you find your device status information, such as network, signal strength, and Wi-Fi signal strength.
In order to see the details about any of your notifications you can pull down the notification bar like a drop down curtain, just slide your finger from the top of the screen down-wards
The Notification bar is also where you can manage your device with a ton of shortcuts!