How to turn on vibration on Windows Phone
This tip shows how to vibrate the device for a specified period using the VibrateController class.
The VibrateController class can be used to vibrate the device for a specific period. This can be useful for acknowledging a button press if visual cues alone are not enough (for example one of my apps that has a 'copy clipboard' button did not have a visible reaction so I added a short vibration to notice the user that the tap was successful).
This code snippet is all that is required to vibrate the phone for 100ms: