Mobile devices have reached an impasse. Although the resources that can be integrated onto mobile handheld devices will continue to improve, faster CPUs, more RAM, faster wireless NICs, making substantial use of these resources will require a major breakthrough in battery technology. To bypass these limitations, MAUI (Mobile Assistance Using Infrastructure) is a system that enables fine-grained offloading of mobile applications to cloud-based infrastructure. By leveraging nearby infrastructure, MAUI enables a new class of resource-intensive applications, such as augmented reality, to run on mobile handheld devices. With MAUI, we enable resource-intensive .NET applications to run on Windows Mobile smartphones. We will demonstrate: A resource-intensive face-recognition application that consumes an order-of-magnitude less energy. A voice-based translation application that previously could not run using only the limited resources available on today's smartphones.