While an increase in operating profit and a year-on-year net profit increase points to a more positive quarter for the Korean company after two years of declining profits, Samsung has warned that it expects earnings to decline in Q4, driven downwards in part by unfavorable foreign exchange rates. Also worrying is the performance of its core smartphones. While the Galaxy S6 and S6+ were well reviewed devices, and the mobile division was able to record a year-on-year increase in profits over 2014's dismal Q3 results, Samsung mobile's profits dropped again quarter-on-quarter as people continue to buy iPhones.