Reuters - Blackberry-maker Research in Motion broke into the top five cellphone makers in January-March for the first time ever, helped by booming smartphone demand. The global handset market has been dominated by five major players -- Nokia (NOK1V.HE), Samsung (005930.KS), LG Electronics (066570.KS), Motorola and Sony Ericsson (6758.T)(ERICb.ST) -- for the last five years.
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