Google's Android and Apple's iPhone platforms continued to take U.S. smartphone market share from their rivals in the third quarter, according to the NPD Group research firm, which said Android increased its share to 53%, with the iPhone climbing to 29%. Research In Motion's BlackBerry system fell to 11%. Among phone vendors, RIM ranked fifth behind Apple, HTC, Samsung Electronics and Motorola. Despite Android's increasing share of the consumer market, developers wrote 75% of new mobile applications for iOS-based platforms, according to the analytics firm Flurry.

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