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In next generation (NG) mobile communication environment, it is expected that mobile services will be user- centric and the mobile service platform will play an important role in supporting various future mobile services not only for service providers to provide services effectively but also for users to use services easily. In-this-paper,-we propose the architecture, functions and protocols of the NG mobile service platform of the NG mobile service platform which gives efficient means of connecting users and service providers to fulfill user-centric mobile services. Then we describe the NG mobile service environment with focusing on the NG service platform and how user-centric mobile services are provided in the NG mobile service environment. We then introduce the context aware follow-me (CAF) service developed as a prototype of promising NG user-centric mobile service followed by introduction of test- bed system developed to investigate feasibility of the CAF service.