Apple's iPhone isn't just for the deep-pocketed crowd. A new study reports that the popular smartphone's buyers are increasingly skewing toward lower incomes -- and helping Apple grow its user base despite the current dismal economic conditions.

While 43 percent of iPhone 3G users earn over $100,000, iPhone adoption increased 48 percent this summer among those earning annual salaries of between $25,000 and $50,000, while it grew 46 percent among those earning between $25,000 and $75,000.

The iPhone demographic study, conducted by comScore and released this week, also found that Overall iPhone use increased 21 percent between June and August.

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