Samsung I9300 GS3 on Sale by US AT&T, T-Mobile, Sprint and more US Carriers

Samsung Officially mentioned that Samsung Galaxy S III mobile phone will be offered for customers of these US Carriers :

AT&T - T-Mobile - Sprint - Verizon Wireless and US Cellular.

The expected time for this is the beginning of this month ( June ) and each one of these above carriers will announce the Plan and the Prices Individually to let the customers choose what is suitable for them, But it is expected to start from 199$ Contract.

On the Side Samsung also announced that it will make any asked customizing by the Carriers but with no more details about the kind of these customizes ( Hardware or Software ).

Source