On the same day Samsung Electronics reported disappointing results for its smartphone business, the Korean giant's Galaxy handsets received an endorsement from an unlikely source: the lawyer for archrival Apple. In his closing argument for Apple's $2 billion lawsuit against Samsung for allegedly copying the iPhone, attorney Harold McElhinny told jurors the Suwon (Korea) company had made other Android handset makers irrelevant. Samsung yesterday announced its mobile division's revenue dropped 2.5% in the first quarter compared with a year earlier, in part because of a surge from new competitors. Samsung has reason to be concerned. The fall in market share was the first since the end of 2009, and the quarterly sales performance was the company's worst since the end of 2012.