Augmented Reality was not meant to hit the iPhone 3GS until at least the release of iPhone OS 3.1. Augmented reality uses your iPhone’s camera, GPS, and compass to show virtual items in the real world. Now Yelp comes with an application that can show information of restaurants etc. but the beauty is there’s an easter egg called Monocle. This features enables you to use Augmented Reality.

» Easter Egg In Yelp Application Activates Augmented Reality