Four things we learned from Samsung’s Q4 earnings call

 Samsung on Wednesday posted its fifth consecutive year-over-year decline in quarterly operating profits. And a big reason for that drop was the poor performance of its mobile business.

The South Korean company’s IT and mobile communications division recorded a 64 percent drop in fourth-quarter operating profit from the year-ago period, to 2 trillion won ($1.8 billion). Only 37 percent of Samsung’s operating profits came from its IT and mobile communications business in the December quarter compared with two-thirds a year earlier.