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This paper addresses issues of service access, and policies to control access to these services. It introduces the mobile phone as a service aggregator and control centre for sensor networks. Semantic policies are used to extend the encryption-based radio link protection by an application layer protection. Two scenarios are introduced, covering home access and content access in the home. The implementation of key elements such as mobile-based key distribution and semantic-based policies are performed in order to show the feasibility of the approach.