LG Electronics Inc., the world\'s third-largest maker of mobile phones, said Thursday that it will launch the Optimus 3D smartphone in S. Korea this week, hoping the new handset will help turn around its loss-making mobile business. LG will start receiving pre-orders for the Optimus 3D smartphone on Friday, before the handset will be exclusively released via South Korea\'s top mobile carrier SK Telecom, its statement said.