Samsung Electronics Co Ltd is heading for its first annual earnings drop since 2011 after it revealed its July-September profit would be the lowest in more than three years and said short-term prospects for smartphones were uncertain. The world’s smartphone leader has seen its global market share decline in annual terms for the past two quarters, according to Strategy Analytics, out-classed by Apple Inc’s (AAPL.O) iPhones in the premium segment and undercut by Chinese rivals like Lenovo Group Ltd and Xiaomi Inc at the bottom end.