Phonemakers bank on virtual reality, add-ons to ignite sales

By Se Young Lee and Harro Ten Wolde SEOUL/BARCELONA (Reuters) - From a remote-controlled robot camera to a sonar-enabled smartwatch to locate fish to reel in, smartphone makers are launching new devices and services in a bid to drive sales for their handsets and set themselves apart in a crowded field. Waning global demand for smartphones, especially in key markets such as China, and margin-eroding, cut-throat competition are ratcheting the pressure on manufacturers to find ways to convince cons