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In Telecommunication companies today are operating in highly competitive and challenging environment, after coming MNP (Mobile Number portability) all operators in a computation for save his subscriber base. Telecommunication companies generated a huge volume of data from various operational systems and these are used for solving many business problems that required urgent handling. These data include call detail data, customer data and network related data. Data Mining methods and business intelligence technology are widely used for handling the business problems in this industry. The main application areas of BI and Data Mining in telecommunication industry include fault detection, network fault isolation and comparing network improvement and business improving market effectiveness. This paper describes how data mining and its applications helps Telecommunication industry in various aspects. [ABSTRACT FROM AUTHOR]