Worldwide PC shipments declined 2 percent last year to about 309 million machines while smartphone sales climbed 28 percent to 1.3 billion devices and tablet sales increased 4 percent to 230 million, according to the research firm International Data Corp.Īll but a few of the magazines in Flipboard are free. Meanwhile, sales of mobile devices are still surging despite a recent slowdown in the tablet market. PC sales have been slumping for the past two years, though there have been recent signs the worst of the decline is over.