You can now experience Google Instant on iPhone, iPad, iPod Touch and Android devices. As Google Instant for Mobile becomes available globally, you can use Google Instant on your iOS devices. You need to have iOS 4 or later on iPhone, iPad or iPad Touch. Android users should have Android 2.2 Froyo.
To experience Google Instant on Froyo or iOS devices, simply go to google.com. You’d be able to enable / disable Google Instant from there.
via Google