jailbrokenupdated its Search app on iOS
After installing NowNow, head to your Settings, scroll down to NowNow, and choose the shortcut you want for Google’s voice search (I used a triple-tap on the home button). Using the shortcut will give you quicker access to the Google app than you can get from the home screen. Check out the video above from AppAdvice to see it in action.
NowNow is a free download for jailbroken iPhones, available in the BigBoss repository.