Apple had the best-selling smartphone during the last two quarters of 2012 and its corporate profits, driven primarily by the iPhone, are through the roof — it made over $13 billion in the last quarter alone. Yet its competitors smell blood. Samsung attacked first, with its 2012 ad campaign making fun of iPhone owners, but now even lowly BlackBerry — whose future existence as an independent company is not at all assured — feels comfortable publicly suggesting Apple is faltering.