www.WirelessFederation.com/news: Econet Wireless Group (EWG) of South Africa has reportedly begun moves to block the sale of Kuwaiti-based Zain’s interests in Zain Nigeria until a ruling on a dispute over ownership of the company is passed. Previous media reports indicated that the Zain Group, may agree to a deal to sell its African operations to French company Vivendi for up to USD12 billion.