The Sprint Epic 4G, a Samsung Galaxy S series phone, is being released today. If you haven’t heard about a Galaxy S phone before, you will soon hear about them more and more. For the U.S. carriers, there are four different variants of the Galaxy S from each of the carriers: Sprint Epic 4G, Verizon Fascinate, T-Mobile Vibrant, and AT&T Captivate.

Since their initial release 45 days ago, there has been over a million units sold in the U.S., and only for the two previously released smartphones: T-Mobile’s Vibrant and AT&T’s Captivate.

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