 The mobile phone has changed our ability to assess and intervene with individuals remotely, providing an avenue for ambulatory diagnostic testing and just-in-time adaptive interventions that can be accessed by billions of people. Newer methods of assessment using the mobile phone, including Apples ResearchKit, provide the opportunity for powerful assessments of impulsivity beyond simple self-report. To date, there have been no measures of impulsivity integrated into ResearchKit or any mobile application, aside from the beta version that the investigators recently built, nor has the research community explored the possibilities of passive impulsivity assessment using mobile analytics embedded in all phones. There is preliminary evidence that mobile analytics, such as latency to respond to a text, can predict personality traits associated with impulsivity such as extroversion and neuroticism, and self-report studies reveal that there is a direct relationship between the inability to delay gratification and different patterns of mobile phone use. These studies highlight potential power of mobile phenotyping as a ubiquitous measure of health determinants in billions of people by using passive data that doesnt require user participation. However, foundational research is needed to validate assessments, build adaptive tools, and include individual differences self-regulation capacity as well as interventions to improve regulation in the discussion. 