Gartner: Samsung retains smartphone leadership in 2015 with over 20% market share Posted on March 25, 2016 by Deep Samsung was the top smartphone vendor for both Q4 2015 as well as the complete year, according to a latest report by market research firm Gartner. Specifically, the South Korean company sold over 83.4 million units last quarter, claiming 20.7%Read More Gartner: Samsung retains smartphone leadership in 2015 with over 20% market share