When the iPhone first hit markets in 2007 it revolutionized the cellphone industry. It was a device that incorporated Apple's MP3 player technology with a phone, but it also surfed the Web and took commands through a 3.5-inch touch screen. The iPhone's features, even in the newer-generation phones, still have the power to overwhelm new users, and some of the phone's behaviors, like various vibration and shaking, can seem like malfunctions.
The iPhone uses a touch screen for all forms of input: texting, dialing a number, entering URLs in the built-in browser, launching applications and even for taking photos. The device uses gestures to do different things with the screen, too. You can pinch your fingers on a photo to zoom in or spread your fingers apart to zoom out. Likewise, one gesture causes all of the icons on your home screen to shake. If you tap and hold an icon for too long it will begin shaking. Hold for longer and all of the icons will shake. This allows you to edit and adjust the layout of the screen and is normal behavior. Tap the home button to stop this.
In addition to the screen shaking when the iPhone is waiting to be changed, you can shake the device to change the way the device is operating. By default, the iPhone's music player interprets shaking as a command to shuffle the songs. Other applications use the shake feature for control, too. Some games ask you to shake the device to perform a game-specific action. You can disable the shake-to-shuffle settings in the "iPod" category.
Shaking and vibrating are two different things when talking about the iPhone. Shaking is a form of input, while vibrating is an alert. The iPhone is just like other cellphones in this regard. Instead of a ringer or a chime when you receive an incoming call or a text message, the iPhone can be set to vibrate. When you turn this setting on, the iPhone will vibrate to get your attention.
Changing Vibration Modes
Not everyone likes it when their pocket vibrates every few seconds. You can change the vibration setting on the iPhone to stop it from shaking on your thigh or on your nightstand every time you get a text, annoying all of your roommates. Tap "Settings" on the home screen and then tap "Sounds." You need to adjust both the "Ring" and "Silent" settings, as your iPhone can vibrate in either mode.