Motorola (MOT), once the most dominant cell-phone maker in the world, has fallen mightily in the past couple of years. But the Schaumburg (Ill.) communications-gear manufacturer is now clawing its way back-sustained by the performance of its broadband, government, and enterprise equipment businesses even as the flagship cell-phone division continues its struggle for profitability. Though the turnaround is far from complete, some light can be seen at the end of the tunnel. Motorola co-CEO Gregory Q. Brown, who was chief operating officer in 2007 when Motorola's recent fall from grace began, talked with BusinessWeek's Roger O. Crockett about some of the lessons learned.