 The long-term effectiveness of mHealth interventions i.e., maintenance of sustained HIV RNA suppression over years, will require large and expensive clinical trials. In prudent preparation for a future trial, investigators will collect preliminary efficacy data comparing the peer-navigationsmartphone intervention to usual care for several alternative endpoints, including time to ART initiation, missed visit frequency, and rate of virologic suppression. Investigators will also define the optimal patient load and scope of work for peer navigators and the intensity and frequency of electronic communication that facilitate meaningful peer support. 