Apple is reaping the biggest rewards right now when it comes to selling its smartphones and other devices, but the overall picture for the smartphone market in the year ahead may be a little less rosy. According to the analysts at Germany-based GfK, in 2014 there were 1.2 billion smartphones sold, up 23% on the year before and crossing the billion-unit point for the first time. But they predict sales will slow down to 14% growth in 2015, working out to total sales of 1.368 billion devices.