Beating the slowdown trends, global smartphone sales will grow 13 percent in 2015, it added."China and US will remain the largest smartphone sales countries by 2014, making up 43 percent of global volumes," the report said.

The world's top 20 countries will account for 80 percent of the global smartphone volumes in 2015, up from 75 percent in 2007.

Asia Pacific will continue to drive growth, accounting for 54 percent of the global volumes in 2015.

Central Latin America and Africa Middle East will see strong smartphone growth by 2020 and will play the role of a new growth engine for global market, it said.