The purpose of this study was to develop and examine effects of a residential treatment program for female adolescents with high risk of smartphone addiction. In this study, based on a reanalysis of results of Usage Habit of Internet and Smart-phone survey and focused group interview with experts of addiction-related field, the residential treatment program for smart-phone addicted adolescents was developed. The program includes individual counseling, group counseling, parents and family counseling and alternative activities for 7 nights and 8 days. Effects of the program were tested after a pilot operation with female students and their family. It resulted in the lower level of smartphone addiction scale and positive changes in belief of smartphone use. Parents who participated in the program reported that the program brought positive changes in their child's smartphone use. These results are meaningful in that this new intervention program which reflects the characteristics of female adolescents with high risk of smartphone addiction found to be helpful in alleviating smartphone addiction.