Google's Android operating system edged out Apple's iPhone operating system for the No. 2 spot in the U.S. consumer smartphone market in the first quarter, research firm NPD Group reported Monday.

According to NPD, devices running Android accounted for 28 percent of the units sold to U.S. consumers in the first quarter of 2010.

BlackBerry devices made by Research In Motion, which use RIM's homegrown operating system, took the top spot with 36 percent of the U.S. market. Apple's iPhone, which had been in the No. 2 spot previously, fell to third place with 21 percent of the market.

NPD's figures are based on self-reported consumer surveys and they estimate the number of devices sold to consumers. The figures do not include sales of devices to business customers through enterprise contracts.

Android is an operating system that is available on several different models of phones made by different manufacturers, such as Motorola, HTC, and Samsung. Meanwhile, Apple's operating system is used only on Apple's own iPhone.

Ross Rubin, an analyst with NPD, attributed the strong growth in Android to the fact that devices using Android software are now available on all major U.S. carrier networks.

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