By Helen Nyambura-Mwaura JOHANNESBURG (Reuters) - Shares of MTN rose more than 3 percent on Thursday after Turkcell withdrew a $4.2 billion lawsuit against the South African mobile operator in a dispute over a massive mobile phone contract in Iran. Turkey's largest cell phone operator had filed the lawsuit in Washington last year alleging the Johannesburg-based company used bribery to win a mobile licence in Iran that was first awarded to Turkcell. In a Wednesday filing, lawyers for Turkcell asked to dismiss the case in light of a U.S. ...



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