LTE-Advanced (LTE-A) handsets are gaining momentum across developed and technology-driven market such as the US, China, Japan and South Korea. In Q1 2017, China has become the biggest LTE-Advanced handset market, followed by the US, Japan, South Korea and others. In terms of LTE-Advanced handset penetration out of total LTE handsets, South Korea posted the highest ratio in the world. India posted the significantly lower LTE-Advanced penetration though this nation is the world's 3rd largest LTE handset market. Our HCST service starts to track LTE-Advanced handset volume and share by major vendors by quarter for five countries, the US, China, India, Japan and South Korea.