sentences:  Few mobile phones, however, were able to support the game's technical specifications, so the planned expansion to other Japanese phone carriers and to the United States were not possible.It was announced alongside "Kingdom Hearts Birth by Sleep" and "Kingdom Hearts 358/2 Days" at the Tokyo Game Show on September 20, 2007, where a trailer was shown in a photo-prohibited theater.New trailers were shown at the 2008 Jump Festa in December 2007 and the DKΣ3713 Private party in August 2008.