About : AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

Question

In my project, I used AudioServicesPlaySystemSound(kSystemSoundID_Vibrate) to play SystemSound.When test in iPhone5,it works.
when in the iPhone4,it can‘t work .
Thanks for your help:

here is the code:

        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

I have import AudioToolbox.AVFoundation.framework,#import

but it is no use

Answer 1

this are the two ways to make your device vibrate

1) AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
2) AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

also you need to import

 #import <AudioToolbox/AudioServices.h>