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Mobile phone has become a powerful platform for people-centric computing. It is now a necessary part of everyday life for many people. A growing number of mobile computing applications are on the rise, centered around the user's daily life. In those emerging applications, location dependent systems have been identified as an important component. This paper presents the architecture and implementation of such a location-based application, called Tour-Guide. Implemented on iPhone, the system is designed to provide tour information services; therefore people can get tour guidance information that they need anytime and anywhere.