Samsung Electronics's mobile margins not out of the woods

By Se Young Lee SEOUL (Reuters) - Samsung Electronics may have put a floor under its mobile margins, but sceptics say profits will undergo a new test with the latest flagship Galaxy smartphones, among the most costly the South Korean company has ever made. Samsung's mobile devices division, which accounted for nearly 60 percent of total profit last year, boosted its operating margin to 10.6 percent in January-to-March, according to the company's final quarterly results released on Wedn