The wide deployment of wireless networks and mobile technologies and the significant increase in the number of mobile device users have created a very strong demand for emerging mobile commerce applications and services based on today’s wireless network technologies. This trend has provided many new business opportunities and challenges to e-commerce vendors, mobile service providers, mobile content publishers and marketplaces, mobile technology providers and solution integrators. Living in a wireless world changes and enhances people’s life in many ways, such as communications, information sharing and learning, e-commerce and mobile application services. At the same time, businesses and government agencies are confronted with new pressure for technology update, that is, how to provide customers and users with reliable and secure mobile commerce applications and efficient and user-friendly mobile services. To meet this increasing demand on mobile commerce and mobile services, people are looking for innovative ideas to create next generation mobile-commerce applications and service systems. Mobile commerce and services has become a very hot research subject in both business and research communities. The major theme of this workshop is to study and use new business models and structures to build the next generation of mobile commerce service systems supporting mobile users anywhere at anytime. Goals The Fourth International Workshop on Mobile Commerce and Services (WMCS 2008) is a forum to bring together business people, researchers, scientists, software architects, and industry professionals to discuss innovative ideas and diverse topics on next generation of mobile-commerce and services. Using this forum, researchers and practitioners can exchange issues, challenges, new business models and structures, and new technologies and solutions. Authors are invited to submit original and research papers addressing technical and engineering issues, challenges, solutions, and technologies in building wireless-based software systems and applications. All submissions will be peer-reviewed by members of the international program committee. Accepted paper will be included in the GPC 2008 workshop proceedings (EI-Indexing) published by IEEE Computer Society Press