Remote Evaluation and Alerting for Collaborative Health (REACH) in Depression

Study phase 1: The investigators expect that participants will be in this research study for six months. Participants will be asked to download an app on their smartphone. This app will collect data from the phone's sensors. Participants will also be asked to answer some questions about their mood each month. Study phase 2: This phase of the study is randomized which means that in order to learn about the effect of the Smartphone App, half the people in this study will use it, and the other half will not. If participants decide to enroll into this research study, they will be assigned by chance to one of the following groups: Group A: Participants will be asked to download a Smartphone App. This App will collect data from the phone's sensors. Group B: Participants will have usual care. Both Groups: Participants will be asked to complete questionnaires about their mood each month.