Saturated telecom markets such as Europe and the USA need powerful IT support to find and take advantage of every business opportunity regardless of how small it is. Market analysis has conclusively proved that IT-spending plays a key role in achieving these goals. Today, ARPU increases significantly with IT-spending in mature markets. Explanation: Modern IT-capabilities outweigh low-price politics because air time prices are constantly decreasing anyway. In addition, convergence, partial flat-rates and new services such as mobile data have become reality, hence leading to more complex scenarios which can be hardly calculated without help of high-performance software engines.