Now, all modern smart phones and phones are equipped with a
vibration motor. It is a small electric
motor, on the axis of which a metal cylinder is mounted. ... When a call is received, the
motor starts to
work and rapidly unwinds the cylinder.
Vibrations are transmitted to the phone's case and it starts to
vibrate.
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Google's Pixel phones have by far the best haptics on Android, but even those devices are far behind Apple.