Econet Wireless Global affiliate Liquid Telecom agreed to pay 6.55 billion rand ($428 million) for South African Internet-service provider Neotel Pty Ltd., creating the continent’s largest broadband network and business-to-business phone carrier. Shares of Tata Communications Ltd., which is selling the stake, surged. The buyer is partnering with Royal Bafokeng Holdings, a South African empowerment ...