A context-based, device-centric tool prototype lets users easily customize smart phones, offering low learning costs and high usability. In contrast, we've developed a context-aware solution for existing mobile devices and their applications that people can use independent of external infrastructure. The solution is hence applicable in general mobile usage rather than being restricted to a specific room or space. Our primary goal is to offer a device-centric approach with a broad scope of customizable functionality, while maintaining the low learning costs that end-user development advocates.