Gamertell has posted an opinion piece where the writer claims referring to the DS within the game makes the game's story a bit more believable.
From the article:
"When game developers choose to create a DS game in a manner where the DS a person is playing on is involved in the story, it can help break down reality's boundaries. What if a game could really cause a person to die in a week? What if your DS could help you find your long lost father? Many times the scenarios presented by video games are totally unbelievable, but by including a familiar device, a story becomes more plausible."