Regionless Confirmation

Play-Asia, an online retailer, recieved their shipments of the Japanese DS's today. The DS's are they same compared to the American version except for the default language settings in the main menu (which can be changed). Play-Asia tested using Pictochat, and Super Mario 64 DS multiplayer between USA and Japanese versions of the DS and everything went well. The Japanese DS could also play the American version of Super Mario 64 DS. Along with playing the games the DS seemed almost identical except for the missing Metroid Prime Hunters: First Hunt demo in the Japanese DS. Now its good to know that the DS truely is region free.

Source: Gamecube-Europe

-Ultimate Zelda Guru