Google's open-source Android smartphone OS, used by HTC and Samsung, which reported sales growth of 128.6% and 172.7%, respectively, for the second quarter, could pose the biggest challenge yet to longtime market leaders Research in Motion and Nokia, the IDC research firm says. "Emerging smartphone suppliers, such as HTC, that are allied closely with Google gained share at the expense of the historic top smartphone players last quarter," said IDC analyst Kevin Restivo.

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