The Home Screen
The Home screen is the launching pad for every iPhone activity. It's what appears when you press the Home button. It's the immortal grid of 20 colorful icons against a black background.
It's such an essential software landmark, in fact, that a quick tour might be helpful.
Icons. Each icon represents one of your iPhone apps (programs): Calculator, Maps, Camera, and so on. Tap one to open that program.
Your iPhone comes with 20 or 21 icons preinstalled by Apple; you can't remove them. The real fun, of course, comes when you add to the starter set by downloading more apps from the App Store (Chapter 12).
Badges. Every now and then, you'll see a tiny, round, red number "badge" on one of your app icons. It's telling you that something new awaits: new email, new text messages, new chat entries, new updates for the apps on your iPhone. It's saying, "Hey, you! Tap me!"

Home-page dots. As you install more and more programs on your iPhone—and that will happen fast once you discover the App Store—you'll need more and more room for their icons.
The standard Home screen can't hold more than 20 icons. So where are all your games, video recorders, and tip calculators supposed to go?
Easy: The iPhone automatically makes room for them by creating additional Home screens. You can spread your new programs' icons across 11 such launch screens.
The little white dots are your map. Each represents ...
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