The iPhone 4 has more features than any other iPhone. Let's get started with a quick tour of its highlights, so you know where everything is...
01-Home button
Generally, you press the Home button to return directly to the Home screen, or double click to see recently open applications. Pressing Home on the Home screen will open Search.
02-Volume buttons
Pressing here while making phone calls, listening to music or watching movies adjusts your audio level. Pressing the volume controls at any other time controls how loud the ringer, alerts and other sound effects are.
03-Ring/Silent switch
Toggle easily between Ring and Silent modes. In Silent mode, the iPhone doesn't play any sounds, even when people ring you. The exceptions are alarms set using Clock, or apps such as iPod, that play through the speakers.
04-Retina display
The iPhone 4 display has an astoundingly high pixel density (326 pixels per inch), which makes it impossible for the human eye to perceive individual pixels. It also uses in-plane switching (IPS), for outstanding viewing angles.
05-Accelerometer & gyroscope
Thanks to its built-in accelerometer, the iPhone can always tell which way up it's being held, while the iPhone 4's new gyroscope can detect movement along three different axes.
06-On/Off Sleep/Wake
Lock your phone here to save battery. Press twice during a call to send it to voicemail.
07-Front camera
The VGA-quality front-facing camera is used for FaceTime video chat, or for taking a photo of yourself in the Camera app. The iPhone's main 5-megapixel camera is on the rear, along with a powerful LED flash.
08-Home screen
The Home screen gives you instant access to all the iPhone's applications. The most important live on the Dock near the bottom; here you'll find buttons for Phone. Mail, Safari and iPod apps. One of the joys of the iPhone is that you can customise the icon layout and move them around; see page 26 to learn how.
09-Battery, network and time
The time and battery charge are always displayed on your iPhone's Home screen, along with the level of network coverage you have (in bars) and the name of your service provider. If you're connected to a Wi-Fi network, you'll see an icon representing your signal strength in place of the 3G, E or ° icon.
10-3G and GPS
The 3G capabilities of the iPhone give it super-fast mobile connectivity if you're in an area with 3G reception, and the GPS unit enables your phone to determine your exact location in Maps and other apps; see page 43.
11-Proximity sensor
The sensor turns off the display whenever you lift the phone to your ear, to save battery life and prevent accidental touches.
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