As a GfK survey found earlier this year, just 6 percent of UK and US consumers currently own a wearable device, but according to mobile industry association MEF’s recent survey of 15,000 consumers in 15 countries across 5 continents, about half of consumers know they exist. “It’s fair to assume most of the above users are wearing some kind of health-tracking wristband such as Fitbit,” MEF researchers wrote. “But, to repeat, these devices are hardly mainstream. A study by Parks Associates reported that the number of wearables sold will be 22 million this year.[…]