Dozens of device makers have unveiled wearable gadgets at Barcelona’s Mobile World Congress this week. Downtrodden Taiwanese phone maker HTC is hoping a fitness device it is co-branding with Under Armour, the second-largest sport brand in the U.S., can help it grow again. Korea’s LG has produced a round watch, following the lead of Motorola, which has drawn favorable reviews for its more fashion-conscious alternative to the dozens of bulky, square smartwatches that dominated the […]