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.