In this paper, we present a system architecture that allows users to interact with embedded systems located in their proximity using Smart Phones. We have identified four models of interaction between a Smart Phone and the surrounding environment: universal remote control, dual connectivity, gateway connectivity, and peer-to-peer. Although each of these models has different characteristics, our architecture provides a unique framework for all of the models. Central to our architecture are the hybrid communication capabilities incorporated in the Smart Phones. These phones have the unique feature of incorporating shortrange wireless connectivity (e.g., Bluetooth) and Internet connectivity (e.g., GPRS) in the same personal mobile device. This feature together with significant processing power and memory can turn a Smart Phone into the only mobile device that people will carry wherever they go.