Apple’s iPhone has shaken up the cellphone business. Its next targets are Nintendo and Sony.

The iPhone and the iPod touch, which feature big screens and powerful graphics, are emerging as serious competitors to Nintendo’s DS handheld and Sony’s PlayStation Portable.

Game publishers such as Sega Corp. and Id Software Inc. are devoting more resources to Apple’s devices while start-ups dedicated to making iPhone games have sprung up. Already, there are nearly 2,000 iPhone games available.

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