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The N-Gage never really fit anywhere. It wasn't quite a phone -- because you had to hold it sideways as though you were holding a giant, half-eaten Jaffa cake to your head, and they weren't quite games consoles either, sporting the tiniest of screens. Granted, they were popular amongst the community, but the community barely hit the million mark.
Less than 5 million devices were sold around the world. Though it had Tomb Raider as the popular ported game for the time in MMC-card format, and played excellently I might add (I owned one when I was 15 years old), it was surpassed by other handheld gaming consoles like the Nintendo DS and the PlayStation Portable. Games were also locked to the device, leaving many gamers angry at Nokia's single-device policy.
Its cost alone at $299, back in the day when money was tight, led to its early demise.