Mobile App to Help Survivors of Childhood Cancer Navigate Long-Term Follow-Up Care

PRIMARY OBJECTIVE: I. To determine the difference in survivor/caregiver knowledge and understanding of diagnosis, treatment information, and follow-up needs using the survivorship app. SECONDARY OBJECTIVE: I. To validate the usability and effectiveness of the survivorship mobile application. OUTLINE: Participants are seen in the survivorship clinic and receive education about potential late effects and the survivorship application on study. Participants then use the survivorship app for 4 months on study.