Attracting new customers and retaining existing users are critical for the success of new information systems such as mobile data services (MDS). Thus, it is important to understand the formation process of behavior toward MDS at different stages. However, relative little attention has been paid to the differences in the determinants of behavior toward MDS between potential adopters and experienced users. This study examines the dynamics of customers' decision processes in the MDS context. This study proposes an advanced theoretical framework from multidisciplinary perspectives. The proposed research model is empirically evaluated by using survey data collected from 120 potential adopters and 354 experienced users. This study investigates some significant differences in the influence of the determinants of behavioral intention toward MDS, depending on customers' direct experience with MDS. The results of this study show that the adoption intention is solely determined by utilitarian value whereas continued usage intention is determined by utilitarian value as well as hedonic value.