The latest data from market research firm comScore shows Apple holding on to a quarter of the US smartphone market, which grew roughly 18 percent over the last six months. That makes the iPhone the number two smartphone in the US, though it still lags well behind number one RIM. Android-based devices are still growing rapidly in popularity.

Over the last few months, comScore data shows RIM and Apple holding pretty much steady, with RIM at 43 percent and Apple at 25.1 percent. Unsurprisingly, Palm (which includes webOS and PalmOS) devices and Microsoft-powered devices continued to decline. Android-based devices, however, continued to rise sharply, enough to eclipse Palm to take fourth place in the US market.

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