"The Galaxy S i9000 is available in international markets and can be purchased unlocked in the United States. However, there also variations of the device available from North American carriers, including the Samsung Vibrant for T-Mobile, the Samsung Epic 4G for Sprint, the Samsung Captivate for AT&T, and the Samsung Fascinate for Verizon."
Where I'm standing right now the Sprint version is not a good "phone." That is Sprint's coverage at my exact location makes that version a bad phone.
I hope you get the issue I'm writing about. You should know that the network coverage can make a good phone seem pretty bad.
Samsung galaxy s i9000
Samsung galaxy ace 2 i8160