In many parts of the world, smartphone shipments account for a larger percentage of mobile handset shipments than feature phones and low-cost handsets. Yet within the smartphone class of devices, segmentation is increasing to three price tiers (low, mid, and high). Shipments of sub-US$250 low-cost smartphones will grow from 259 million in 2013 to 788 million in 2018, according to recent Market Data from market intelligence firm ABI Research.