According to our Handset Country Share Tracker (HCST) service, US LTE cellphone shipments jumped sharply in Q3 2013. The US, South Korea, Japan and Europe continued to witness lightning 4G growth as dozens of models from Samsung, Apple, Sony, Nokia and others flooded the market. The United States remains by far the world's largest LTE country, boosted by robust carrier subsidies. This published report, available to clients, tracks global LTE handset shipments and vendor marketshare for 16 major vendors in 4 major LTE countries from Q1 2012 through Q3 2013.