The joint venture, formed in 2001, thrived after its breakthroughs with Walkman music phones and Cybershot cameraphones, both of which leveraged Sony's brands. But it lost out to bigger rivals Nokia and Samsung at the cheaper end of the market, and was late to react to Apple's entry into the high-end of the market. It has refocused its business to make smartphones using Google's Android platform, but has dropped to No. 9 in global cellphone rankings from No. 4 just a few years ago.
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