how to make iphone shake

1.Add the AudioToolbox framework to your target.

2. In the file you intend to trigger a vibration, import the AudioToolbox header file:

#import <AudioToolbox/AudioToolbox.h>

3. Finally, call the following line to make the device vibrate:

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

needed to change an iphone setting .

For sounds , had vibrate turned off.

change vibrate to ON under sounds