Motorola Tuesday said its mobile phone revenues fell by 51 percent in the fourth quarter of 2008, and said it plans to improve phone sales in 2009 by developing fewer new handsets with a focus on smartphones that run the Android operating system.

The focus on Android will give Motorola a chance to capitalize on handsets that integrate social networking functionality, which is expected to sell well in the market, Motorola Co-CEO Sanjay Jha said in a conference call Tuesday morning.

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