The smartphone has been popularized with the activation of the internet, and the use of the smartphone
has increased because it can be used in real time without the space constraints. Therefore, this study is to
investigate the usage intention of smartphone. First, we examine the effect of smartphone characteristics,
technology sophistication, product advertisement, and degree of use, on usage satisfaction of smartphone.
Second, we also investigate the relationship between usage satisfaction and usage intention of smartphone
such as the repurchase intention and mouth to mouth intention. Finally, we analyze the moderating effect of the communication fee between usage satisfaction and intention of smartphone. This study tested the
research model based on the 275 questionnaires and the hypotheses were verified based on the structural
model. The results show that technology sophistication of smartphone and degree of use have a positive
effect on the usage satisfaction of smartphone. The usage satisfaction has a positive effect on the purchase
intention of smartphone and word to mouth. Finally, the moderating effect of communication fee between
usage satisfaction on word to mouth was found. This study will provide useful information to researchers
and practitioners who are interested in using smartphones.