You can explicitly invoke vibration on an iPhone by using the kSystemSoundID_Vibrate constant when you call the AudioServicesPlaySystemSound function. https://developer.apple.com/library/ios/documentation/MusicAudio/Conceptual/CoreAudioOverview/CoreAudioEssentials/CoreAudioEssentials.html
You can explicitly invoke vibration on an iPhone by using the kSystemSoundID_Vibrate constant when you call the AudioServicesPlaySystemSound function.
https://developer.apple.com/library/ios/documentation/MusicAudio/Conceptual/CoreAudioOverview/CoreAudioEssentials/CoreAudioEssentials.html