MTN Group, the wireless carrier facing a combined $10-billion in claims from authorities in Nigeria, said it may no longer seek to raise capital through an initial public offering on the country’s stock exchange. Africa’s largest mobile carrier is reconsidering the IPO amid a dispute with authorities in its biggest market that wiped more than a third off the company’s market value over three weeks. MTN pledged to list the shares after being fined $1-billion for not disconnecting SIM cards two years ago.