In recent years, mobile phone is a necessary device in life, because it provides much easiness in education, work, business, etc. but extreme use of communication devices, especially among young people are related with mental health problems. So, the aim of this study was surveying of relationships between personality traits with Mobile dependency in high school students. The research method was correlation. The population were included all high school students that 220 students were selected by cluster sampling method. Research data were collected by McCare & Costa's NEO personality traits (Neuroticism, Openness to new experience, Extroversion, Agreeableness, and Conscientiousness) and Jenaro's Mobile dependency inventory, and were analyzed by Pearson correlation formula. The results showed that there is positive and significant relationship between Neuroticism and openness to new experience with Mobile dependency, and positive and significant relationship between extroversion, agreeableness, and conscientiousness with mobile dependency. Thus, it can be concluded that personality traits have main impact on mobile dependency.