Nokia (NYSE: NOK) has improved the way it measures the global device market, including coming up with a better way to calculate the number of unlicensed and counterfeit products being sold in the market. Given that, Nokia went back and recalculated the industry’s overall performance last year and how it did comparatively.

Using the new methodologies, Nokia said 1.26 billion phones shipped in 2009, up from its original estimate of 1.14 billion. Because the market grew, and Nokia’s sales stayed constant, the handset maker’s share sank to 34 percent from a previous estimate of 38 percent. Nokia has also revised its expectations for 2010. It expects volumes to grow by a healthy 10 percent, which should be a welcome sign compared to a relatively flat 2009, but said it expects its market share to stay flat.