Smartphones work well for smart people? Most Taiwanese were getting used to have menu to follow, if they buy a new device, that is, Taiwanese acculturate the difficulty to use a new technology, such as smartphone without menu introduction. Thus, the present study was focused on exploring how the implicit knowledge of users, affects the behavioral attitude when using smartphones. A total of 305 questionnaires were received, 293 of which were valid. A path analysis showed that out of a total of 9 hypotheses were supported, and all agreed with the related references and all had significant positive effects. The most important result was that implicit knowledge positively correlated with users' perceptions of usefulness and ease of use, and thus affected both attitude and behavioral intentions.