RecruitingBehavioural interventionEffectiveness and Implementation of Text Messaging to Improve HIV Testing in AdolescentsThis study will test the effectiveness of a text message-based intervention on human immunodeficiency virus (HIV) testing behaviors among adolescent (13-19 year old). To test the effectiveness on HIV testing behaviors we will randomize participants to the treatment or an attention matched information only control arm and asses our primary effectiveness outcome of objective HIV testing (e.g., photo of test results).