What is the difference between iPhoneUtils.Vibrate() y Handheld.Vibrate() ????

iPhoneUtils.Vibrate() is an old method from an old class, it’s back from the time when there were no released Android support. Now it’s replaced by a more general class named Handheld, the methods in Handheld class works on all handheld platforms supported by Unity. So it’s recommended that you use Handheld class instead of iPhoneUtils.