How does a phone vibrate?

Question

How does a phone vibrate?

In: 350

Answer 1

Inside the phone a motor pushes a big weight backwards and forwards really fast.

That’s it. Nothing fancier on the “vibration” side. The cobtroller for that vibration is the bigger complexity, as it has to compute digital signals of ones and zeros to analogue movement using + and – voltages to move that weight. But still not super complex.

Answer 2

Fast rotation of a motor. Usually we make them rotate smooth (like in cars).

But in phones we purposely make them run rough.