Servicing more than 65.8 million group subscribers, Turkcell is the leading operator in Turkey and the third largest GSM operator in Europe. With more than 50,000 employees and a group of companies within its organizational structure, the firm not only operates in Turkey but also overseas such as Kazakhstan, Ukraine, Azerbaijan, Georgia, Belarus, Moldova, Northern Cyprus and Turkcell Europe. The company then started looking at all possible solutions that were available in the market. After a careful review, the firm chose Microsoft Forefront UAG.