Nokia was once the largest mobile phone manufacturer in the world but lost significant market share in the late 2000s and early 2010s. It failed to keep up with the shift to smartphones led by Apple's iPhone and Google's Android operating system. Nokia's Symbian platform struggled to compete and its transition to the Windows platform came too late. This allowed competitors like Samsung and local Indian brands to gain ground in both high-end and low-end markets. Nokia's financial difficulties led it to sell its mobile phone business to Microsoft in 2013, marking its decline from dominance in the mobile industry.