Finnish mobile phone maker Nokia reported a 30 percent decrease in third-quarter earnings and a 5 percent drop in sales on Thursday. However, the company was able to improve gross margins at a time when the global economy is faltering and spending on consumer electronics is decreasing in the United States and in Western Europe, two of Nokia’s biggest markets. Nokia announced 1.09 billion euros in earnings during the quarter ended Sept. 30, down from 1.56 billion euros during the same period a year ago.