Kuwaiti mobile operator Zain posted a 21 percent lower second-quarter net profit of KD70.3 million ($257.3 million), according to Reuters calculations, missing analyst estimates.Net profit in the six months to June 30 came in at KD140.2 million ($514.1m), Zain said in a statement.Analysts surveyed by Reuters had expected the firm to post an average second quarter net profit of KD87.4 million.The company had made a net profit of KD89.4 million, excluding gains from the sale of its assets in Africa. From / Arabian Business