Problems With Access to Health Care

The goal of this clinical trial is to pilot test a psychosocial-behavioral mobile health (mHealth) human immunodeficiency virus (HIV) prevention intervention in people who use drugs presenting to the emergency department (ED). The main question the study aims to answer is: is the intervention acceptable and appropriate? Participants will use the mHealth app while waiting in the ED and also at home for 90 days. Participants will be asked to complete surveys at baseline, before leaving the ED, and at 30-, 60-, and 90-day follow up visits.