We reported that Google Instant beta was appearing on Android devices last week. Yesterday, Google made it official, introducing the predictive search-as-you-type functionality for iPhones and Android.
You should see Instant beta if you have Android 2.2 ("Froyo") devices and iPhones and iPods running iOS 4 in the U.S. in English. To try it out, hit the "Turn on" link beneath the search box on google.com.
Google said they're "pushing the limits of mobile browsers and wireless networks. You will probably notice a big improvement in speed when you search thanks to a new AJAX and HTML5 implementation for mobile that dynamically updates the page with new results and eliminates the need to load a new page for each query."
Google also pointed out that Instant mobile works best on 3G and WiFi networks. Bad connection? Just disable it.
Here's a quick demo video of Google Instant mobile:
If you have Instant for mobile, what do you think?