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Numerous applications, ranging from disaster management to smart buildings, have been proposed for sensor networks. The practicality of these applications depends on the ability of users to interact with these networks, in many cases in real time. In this paper we propose that cell phones interact with sensor networks and obtain the relevant information in real time. Cell phones can communicate with cellular network and sensor networks at the same time. This unique ability is used to provide better authentication and security. We propose an architecture for these networks along with protocols that can be used to establish secure communications. In our architecture, we use gateways, as intermediate nodes between cell phones and sensor nodes. We propose solutions to detect and revoke captured gateways.