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In mobile networks a service provider needs access to the user data for providing rich and context-aware service like locating the position of mobile user. Mobile assistant (MA) acts as a user data broker network element. Mobile assistant has a complete access to all static and dynamic user data. The purpose of Mobile assistant is to accept requests for user data, to determine user's context, to extract sharing data rules for a particular context, to acquire the requested user data and to provide the data back to the requestee, if the data is to be shared according to the user's preferences. A prototype of Mobile assistant has been developed in Java for this research.