Driven by Research in Motion's BlackBerry and Google's Android-powered devices, smartphone usage among Americans climbed 18% in the quarter ended January from the previous three months, according to comScore. The research firm cited the popularity of text messaging and social networks as the main catalysts for the smartphones' continued growth. Motorola, although losing 1.2% in market share, remained the most popular cell phone maker, followed by LG Electronics and Samsung, which saw its shares tick down and up, respectively.

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