Mobility, context-awareness and payment combined provide a customer with a completely new setting of consuming services at any time and any place. We introduce SmartRestaurant service, which allows customers to use mobile devices for ordering and paying lunches from a nearby campus restaurant beforehand. Further, SmartRestaurant provides the restaurant with means of adjusting the sales with production capacity and prior knowledge of upcoming orders. We present a user evaluation of the system in form of a field trial in the real environment of use. Categories and Subject Descriptors C.2.1 [Network Architecture and Design]: Wireless communication; K.4.4 [Electronic Commerce] General Terms Experimentation Keywords Context-aware, Mobile payment, Indirect mCommerce, B2C