Control Centre only shows a few of the options available within the main Settings app, so let's tap on Settings now to take a closer look. The various settings are arranged into groups, apparently reflecting Apple's idea of the main priorities for daily use. So top of the list is Airplane Mode - because, of course, we are all rich Apple executives who spend all of our time jetting off to meetings with Bono and Dr. Dre.
We also use Airplane mode as a last resource when we are running low on battery as it stops some of the processes on your phone that could use up your final 10 percent.
Wi-Fi, Bluetooth and Data Roaming on the iPhone
Next on the list are other key settings, such as WiFi and Bluetooth, and on the iPhone and iPads with mobile broadband there are settings for your mobile network and data communications.
One really important option that you'll find within the Cellular settings panel is for Data Roaming. Turning Data Roaming off restricts your data and Internet connection to WiFi only, so that you don't run up a big bill by accidentally trying to use mobile broadband when you're overseas.
Notifications on the iPhone
Next on the Settings list is a group of options that relate to your device's Lock screen. These include the ability to deactivate Control Centre on the Lock Screen, and to set up the Do Not Disturb option, which can be used to silence incoming calls and notifications.
You can also activate Do Not Disturb by using Control Centre - it's the crescent moon icon right at the top - or even set up a schedule so that Do Not Disturb turns itself on and off at certain times of day.
But the most important option here is Notifications. Many of the apps on your iPhone or iPad can send you 'notifications' - messages that pop up on screen to announce that you've just received a new message in Mail, or perhaps a breaking news story from the BBC News app.
It's useful to know when an important email has arrived, of course, but many notifications can just be plain annoying - yes, Plants Versus Zombies 2, we're looking at you.
The Notifications panel shows a list of all apps that can send notifications, and allows you to turn notifications on or off for each individual app. You can also fine-tune notifications - perhaps blocking them from the Lock screen, but allowing them to appear when the device is unlocked and in use.
General Settings on the iPhone: Software Update, Auto-Lock & Usage
Sign up for CIO Asia eNewsletters.