Mobile subscription growth of 38 percent in a mature market is something operators haven't seen for many years. Remarkably, this is what the world's top ten operators experienced last year with machine-to-machine (M2M) subscription adoption, according to Berg Insight, leading to around 3.4 percent of their aggregate subscriber base of 2 billion being connected to machines and not people. This growth, together with the particular characteristics of the M2M business--very low service costs and almost non-existent churn--are catching the attention of European carrier in urgent need of finding new revenue sources. How are these operators making sense of the new business models required to capture M2M growth? Find out in this special feature.