There were less than 500 N-Gages sold in the UK in it's launch week. Ouch!!
Nokia really blew this one. They needed to build up some unique complements - killer games - that you couldn't play anywhere else. Right now, the platform has very little value - crap games, a crap main component (the N-Gage itself), and no network externalities. No wonder no one's buying it.
They also need to build a learning capability - people have been pointing the flaws in the N-Gage for months
. Obviously, ignoring them wasn't the smartest move.