SEOUL/BARCELONA (Reuters) – South Korea’s Samsung Electronics Co Ltd unveiled its latest Galaxy S smartphones, featuring a slim body made from aircraft-grade metal, in a bid to reclaim the throne of undisputed global smartphone leader from Apple Inc. Designed from scratch in an operation dubbed “Project Zero”, the Galaxy S6 and its curved-edges variant are critical for Samsung’s plans to reverse plunging smartphone revenues that led to its first annual earnings fall in three years in 2014. A warm initial reception sent Samsung shares on Monday to their highest in nearly nine months.