Apple's iPhone user base is now the second-largest in the U.S. smartphone market, passing Windows Mobile-based models to slip into the spot behind Research In Motion's (RIM) BlackBerry, research firm comScore said today.

In the three months ending in October, Apple's iPhone was used by nearly 9 million Americans as their primary phone, said Mark Donovan, senior analyst with Virginia-based comScore.

That compared with the almost 15 million who identified RIM as the maker of their primary smartphone in the monthly surveys comScore conducts of U.S. mobile subscribers over the age of 13. Phones powered by Microsoft's Windows Mobile, meanwhile, were used by an estimated 7.1 million people during the same period.

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