The front-runner of Sprint's smartphone pack is the Samsung Epic 4G. Boasting a 4-inch AMOLED display that shows smooth, crisp animation, this phone stands out for its impressive physical keyboard, front-facing camera, and 4G network support. If you don't like the slide-out keyboard, you can opt to use the TouchWiz, Swype, or native Android software keyboard. The Epic 4G also comes loaded with the social network aggregator Social Hub--a part of Samsung's TouchWiz 3.0 interface--for easy posting access to Facebook, MySpace, and Twitter. The Epic 4G runs on Android 2.1 ("Éclair"), and is the most impressive Galaxy S phone we've reviewed.