The use of the Internet and digital devices may encourage social interactions among the elderly. However, the utilization rate of smartphones and other digital devices is not very high among the elderly. A questionnaire was administered to 119 elderly people aged 65 years or older to determine the association between smartphone usage frequency and the frequency of social interactions among them. Our results discovered that 83.2% of the elderly respondents used smartphones. Those who reported using their smartphones more frequently had fewer instances of social isolation and greater numbers of social interactions with others. Our findings also revealed a significant association between the frequency of using social networking services (SNS) on smartphones and the number of social interactions among the elderly. Our findings indicated that the use of smartphones as a means of communication may lead to more social interactions among elderly people.