Abstract: Generally, a mobile grid computing system includes one or more mobile grid computing systems, a virtual computing server that controls distribution of data processing tasks across the mobile grid computing systems, and an accounting server in communication with the virtual computing server. Each of the mobile grid computing systems includes a grid computing server and mobile devices provisioned to perform data processing tasks received from the grid computing server and to communicate results from the performed data processing tasks to the grid computing server. The accounting server collecting information about the completion of data processing tasks by the virtual computing server.