This Quick Start guide tells you how to set up your iPhone and use its key features. To start, turn on your iPhone by pressing and holding the On/Off button for a few seconds. Then follow the onscreen instructions to set up your iPhone. Button basics. To turn off or restart iPhone, press and hold the On/Off button for a few seconds, then drag the slider to confirm. To turn off the screen but still receive calls, press On/Off once. Press the Home button at any time to return to the Home screen. To quickly switch between recently used apps, double-click the Home button and tap an app icon. Make a call. Tap a phone number in Contacts, Favorites, an email, a text message, or almost anywhere in iPhone to make a call. Or open the Phone app and tap the Keypad button to dial manually. To silence an incoming call, press the On/Off button once. To send a call directly to voicemail, press On/Off twice. To answer a call while using the iPhone headset, press the center button once. Press it again to end your call. FaceTime. Select someone from your contacts and tap the FaceTime button to start a video call with another iPhone user or an iPad, iPod touch, or Mac user. Or while you're on a voice call, tap FaceTime to begin a video call. During a video call, tap the Camera button to switch to the rear camera and share your surroundings. Messages. Tap the Messages icon to send an iMessage to other iPhone, iPad, and iPod touch users running iOS 5, or to send an SMS or MMS to other mobile phone users. Type a name or phone number in the To field or select someone from your contacts. Type your message, then tap Send. To send photos or video, tap the Camera button. Intelligent keyboard. iPhone automatically corrects and suggests words as you type. So if you tap a wrong letter, just keep typing. To accept the suggested word, tap the space bar. Or tap the "x" to ignore the suggestion. The keyboard automatically inserts apostrophes in contractions...