The iPhone platform could overtake rivals Nintendo and Sony for the lead in growing handheld gaming in as little as five years, a DFC Intelligence report says. The analyst group believes portable hardware from the Japanese companies is likely to still lead in terms of sheer units in the future but believes growth has "peaked" for devices like the DSi or PSP Go where Apple's platform is still climbing quickly. By 2014, the iPhone and iPod touch are expected to be the only major devices still seeing significant growth.