By Miyoung Kim SEOUL (Reuters) - Samsung Electronics Co Ltd missed already modest expectations for its quarterly earnings guidance on Friday, deepening worries that its smartphone business may have peaked, as growth in sales of its blockbuster Galaxy phones begins to wane and new rivals emerge to eat away at its market share. The Galaxy S, powered by Google's free Android platform, propelled the South Korean firm into the top rank of smartphone makers in 2012, overtaking Apple Inc whose iPhone had set an industry standard five years earlier. ...



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