African telecoms giant MTN on Wednesday reported weaker than expected earnings, as currency fluctuations bit into the South African company's bottom line. Revenue jumped nearly 10.9 percent in 2012 to 135 billion rand ($15 billion), but headline earnings per share increased just 1.9 percent to 10.89 cents from 10.69 cents. The mobile giant operates in 22 African and Middle Eastern countries, and now has 189.3 million customers, up over 15 percent.