N-Gage was a symptom of the larger problems Nokia had. Conflicting views and power battles between different departments and teams, bad management, and the most important factor was hubris. The company thought how the golden age of 90s and early 00s would last forever… and then Steve Jobs revealed the first iPhone in 2007.

A documentary titled The Rise And Fall Of Nokia is definitely worth watching because it features many interviews of former Nokia executives. Good insider look on the downfall.