As discussions on ubiquitous learning environments are growing, this study was conducted to understand the patterns of smartphone use with social network service (SNS). Students from K university in Korea taking a Distance Learning class participated in the study and used smartphones in blended learning settings. Especially, this study focused on addressing the effects of SNS applications supporting realtime or non-realtime communications. Accordingly, four SNS applications - multimedia messaging service, microblog, wiki, and web discussion - were selected and used for online learning activities. As a result, the multimedia messaging service and microblog applications were generally used for the participants' affective expression and administrative tools, whereas the wiki and web discussion applications were particularly effective for learning itself. Also, participants preferred using multimedia messaging service and microblog applications on smartphones with relatively short messages. For longer discussions with deep reflection, participants used desktop or laptop computers more, while smartphones played a role in reading learning contents. In terms of formality and instantaneousness, there were different results of usage by each of the SNS applications. Based on the results from the study, suggestions were made for future research. First, it was required to develop systematic learning strategies in order to use smartphones for learning. Second, optimal smartphone applications including SNSs should be developed and used for effectiveness and efficiency of instruction. Last, there is a need for institutional support for enhancing ubiquitous learning environments with smartphones and other related tools.