Having been all but left for dead, Finnish smartphone player Nokia (NOK 0.39%) deserves ample credit for engineering an impressive transformation over the last several years. Under the leadership of CEO Steven Elop, the company ditched its "burning platform," and now has big plans in the smartphone space. And while the company is in undeniably better shape, it faces what could potentially be its greatest challenge yet --regaining its lost share in the booming smartphone space. However, that might not be as easy for Nokia as one might think. In this video, Fool contributor Andrew Tonner gives his reasoning for why, despite its obvious improvements, Nokia could still find itself on the ropes again.