BACKGROUND: Studies of undervaccinated children of minority/stateless populations have highlighted significant barriers at individual- community- and state levels. These include geography-related difficulties- poverty- and social norms/beliefs. OBJECTIVE: The objective of this study was to assess project outcomes regarding immunization coverage- as well as maternal attitudes and practices toward immunization. METHODS: The StatelessVac" project was conducted in Thailand-Myanmar-Laos border areas using cell phone-based mechanisms to increase immunization coverage by incorporating phone-to-phone information sharing for both identification and prevention. With limitation of the study among vulnerable populations in low-resource settings the pre/post assessments without comparison group were conducted. Immunization coverage was collected from routine monthly reports while behavior-change outcomes were from repeat surveys. RESULTS: This study revealed potential benefits of the initiative for case identification/ immunization coverage showed an improved trend. Prevention strategies were successfully integrated into the routine health care workflows of immunization activities at point-of-care. A behavior-change-communication package contributes significantly in raising both concern and awareness in relation to child care. CONCLUSIONS: The mobile technology has proven to be an effective mechanism in improving a children's immunization program among these hard-to-reach populations. Part of the intervention has now been revised for use at health centers across the country."