Apple's iPhone 3G dethroned the top-ranked Motorola RAZR as the leading handset purchased by adult consumers in the U.S. during the third quarter of the year, according to market research firm NPD. The shift puts an end to the RAZR's three-year run atop the market, with the Motorola handset falling to the second slot, followed by Research in Motion's Blackberry Curve, LG's Rumor, and LG's enV2, respectively.

"The displacement of the RAZR by the iPhone 3G represents a watershed shift in handset design from fashion to fashionable functionality," said Ross Rubin, director of industry analysis for NPD. "Four of the five best-selling handsets in the third quarter were optimized for messaging and other advanced Internet features."

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