You can’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. On the iPhone X, the face-recognition system includes an infrared lamp, 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.
Side Button (On/Off)
You could argue that knowing how to turn on your phone might be a useful skill.
For that, you use what Apple calls the side button. (It used to be called the “sleep switch,” but it now has more responsibilities.) On the iPhone 6 and later, it’s on the right edge; on the 5s and SE, it’s on the top. (That’s right—on those phones, the side button is on the top. Keep up.)
The side button has several functions:
Sleep/wake. Tapping it once puts the iPhone into Sleep mode, ready for incoming calls but consuming very little power. Tapping it again turns on the screen so it’s ready for action.
On/off. The same switch can also turn the iPhone off completely so it consumes no power at all; incoming calls get dumped into voicemail. You might turn the iPhone off whenever ...
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