Chapter 1. The Guided Tour
You won’t believe how much is hidden inside this sleek, thin slab. Microphone, speaker, cameras, battery. Processor, memory, power processing. Sensors for brightness, tilt, and proximity. Twenty wireless radio antennas. A gyroscope, accelerometer, and barometer. And on the Face ID phones—that is, the recent phones that don’t have a home button—the face-recognition system includes an infrared lamp, an infrared camera, and a tiny projector.
For the rest of this book, and for the rest of your life with the iPhone, you’ll be expected to know what’s meant by, for example, “the side button” and “the Lock screen.” A guided tour, therefore, is in order.
Sleep and Wake
For most of its existence, your iPhone will be neither on nor off. It will be asleep. It sleeps whenever you don’t touch the screen for a while (you choose the interval), or when you press the side button.
In sleep mode, the screen is dark, yet the phone stays on alert to take an incoming call or message. If you’re on a call, it continues. If music is playing, it keeps going. If you’re recording audio, the recording proceeds.
But with your phone asleep, you preserve battery power. And you don’t have to worry about accidental button presses. (You wouldn’t want to discover that your iPhone has been sending texts or taking photos from the depths of your bag. Nor would you want it to dial a random number from your back pocket, a phenomenon that’s earned the unfortunate name butt-dialing.)