Samsung Electronics Co Ltd on Thursday said it would revamp its smartphone line-up to take on competitors in the rapidly growing mid-to-low range segment, after third-quarter earnings set it on course for its worst year since 2011. The global smartphone leader’s market share declined in annual terms for the third straight quarter in July-September, lagging Apple Inc (AAPL.O) in the premium market and overtaken by rivals like Lenovo Group Ltd and Xiaomi Inc at the bottom end, research firm Strategy Analytics said.