This document provides an overview of mobile cloud computing. It discusses how mobile cloud computing combines mobile computing and cloud computing to address the limited resources of mobile devices. The document outlines three approaches to mobile cloud applications, including extending cloud services to mobile devices and using cloud resources to augment mobile applications. It then describes the architecture of mobile cloud computing and security issues related to confidentiality, integrity, availability, authentication, and accountability. Finally, it discusses some open issues for implementing cloud computing on mobile devices related to limited resources and networking challenges.