The purpose of this study was to analyze differences in ecological factors according to cell phone dependency and use purpose in cell phone users among children. Ecological factors of children were consisted of personal, family, school and community variables. A data of the Korean Child-Youth Panel Survey(KCYPS) was employed. The participants were 1,609 cell phone owned 4th grader of elementary school(male: 727, female: 882). Major findings from this study are as follows. First, dependency and use purpose of cell phone were classified by cluster analysis into four groups with similar characteristics : 'low dependency-low use', 'middle dependency-entertainment', 'high dependency-multipurpose', 'middle dependency-sociability' groups. Second, the group differences in ecological factors were statistically significant excepting family variables and teacher relationship. The 'low dependency-low use' group showed highest on adjustments, and 'middle dependencyentertainment' group was most maladaptive. The 'middle dependency-sociability' group had higher on adjustments than 'high dependency-multipurpose' group. The 'middle dependency-sociability' group was adaptive similar to 'low dependency-low use' group excepting self-regulation. Finally, implications for future research were discussed.