Smartphone Addiction Recovery Coach for Young Adults (SARC-YA) Experiment

At discharge from outpatient treatment, researchers will recruit 300 young adults and randomly assign them to recovery support as usual control condition or the Smartphone Addiction Recovery Coach for Young Adults (SARC-YA) experimental condition. Participants in the experimental conditions will receive a smartphone, a calling/texting/data plan, and the SARC-YA mobile applications for the first 6 months post treatment discharge. Experimental participants will 1) complete a 2-3 minute recovery-focused ecological momentary assessment (EMA) at 5 random times a day, receive feedback on their current answers, and provided access to behavioral charting of their past answers over time; and 2) receive continuous access to a suite of self-initiated ecological momentary interventions (EMI) to support their recovery via tool box of coping tools, apps related to getting support, and apps related to maintaining a healthy lifestyle. Data include standardized assessments, urine tests, mobile phone metadata, EMA responses, and EMI utilization. The study's primary aim and hypothesis are: Aim 1: Test the effects of experimental assignment on the frequency of substance use. H1 Relative to the control group, participants in the experimental group will have lower scores on the quarterly Substance Frequency Scale (3, 6, 9 months post- discharge).