Samsung Electronics Co. fell to a two-month low in Seoul trading after forecasting a slowdown in smartphone demand and predicting that a stronger currency may cut operating profit by $2.8 billion this year.

The world’s largest maker of mobile phones, TVs and computer-memory chips dropped 2.5 percent after stoking concerns about the smartphone market triggered by an Apple Inc. share plunge Thursday. The forecast also overshadowed a better-than-expected 76 percent jump in quarterly net income.