Inclusion Criteria - Main study:  Adults (≥18 years) and adolescents 16-17 years. HIV-positive and attending a local City of Cape Town (COCT) clinic to commence ART. Able to provide full informed consent, with a written signature. For those who are illiterate, a witness will be present throughout the process and will sign the form, while the participant will add their right thumb print. For those who are aged 16-17 years, informed written assent will be obtained, and the adolescent must have a parent or guardian who can provide full informed consent (see **below for how parent/guardian is defined for this purpose). Access to a working cellphone and willingness to receive study-related messaging on that phone. Willingness to comply with study procedures, including providing regular updates of contact details /locator information, and use a EAM device for the duration of participation.  Other Inclusion Criteria:  Aim 1: In-depth interviews (IDIs) with subset of trial subjects at baseline and months 12 and 24.  Participation in the main trial. Self-reported prior experience with substance use, depression, gender inequity, stigma, or transport/clinic issues.  Aim 2: Questionnaires and IDIs with staff members at study clinics (three total clinics).  Adults (≥18 years) Staff at study clinics, providing HIV care and/or treatment.  Aim 2: Focus group discussion (FGD) with City of Cape Town officials.  Adults (≥18 years) Staff at City of Cape Town.  Exclusion Criteria - Main study:  Clinical conditions as assessed by the COCT clinic clinicians at first visit e.g. renal disease, which preclude the use of a single tablet regimen (with the exception of those on tuberculosis (TB) treatment who are required to take an extra dose of dolutegravir daily). Planning to leave Cape Town permanently within the next 24 months. Being perinatally infected with HIV. Being infected from birth typically means a set of experiences and complications at a young age that require unique and special attention. If an adolescent, taking their ART medication as a syrup, as they are required to use the electronic adherence monitor (Wisepill device), which is only suitable for tablets.  Other Inclusion Criteria:  Aim 1: IDIs with trial subjects.  • None.  Aim 2: Questionnaires and IDIs with staff members at clinics. • None.  Aim 2: FGD with City of Cape Town officials.  • None.