One of our readers has pointed out that a promotional site for N-Gage in India has a list of compatible devices which includes the Nokia 5800. The 5800 XpressMusic doesn't appear on any other N-Gage site, so this could just be a simple mistake. The site maintainers may have confused it with the 5630 XpressMusic, which definitely is N-Gage compatible but doesn't appear on the Indian site.
Read on in the full article.