It's time for another PhoneDog dogfight! Aaron pits the Apple iPhone 4 and the Samsung Galaxy S 4G against each other. The iPhone 4, now available on AT&T and Verizon, offers Apple's A4 processor, a 3.5-inch Retina Display, 5-megapixel camera, and a front-facing camera for video calling. T-Mobile's Samsung Galaxy S 4G is an evolutionary upgrade from the Vibrant and features a 1 GHz Hummingbird processor, 4-inch Super AMOLED display, 5-megapixel camera, front-facing camera, Android 2.2 with Samsung's TouchWiz UI, and an improved 1,650 mAh battery.

They're both good devices, but only one can take home the gold. Will it be the Apple iPhone 4, or the Samsung Galaxy S 4G? Tune in to see who wins! Part 2 of 2.