RecruitingPhase 2Behavioural interventionLeveraging mHealth to Promote Opioid Use Recovery and Mental Health Among Residents of a Medium-Sized Midwestern CityThe sequential trial compares recovery and mHealth engagement outcomes among Black participants who participated in the mHealth intervention uMAT-R or uMAT-R + enhanced community engagement. The mHealth intervention seeks to support people in various stages of recovery who are also seeking other forms of substance use treatment. Participants are recruited from community-based substance use treatment facilities and recovery services. Participants must be adults who have or are currently using opioids and/or stimulants.