This document summarizes the beta test results of an mHealth HIV prevention program called Guy2Guy for sexual minority adolescent males. Eighteen participants were randomized into an intervention or control group and received program messages for 5 weeks. Participants provided positive feedback on the program content, features like the Text Buddy, and timing of messages. Participants in the intervention group sent more Text Buddy messages and accessed the program feature G2Genie more than those in the control group. The beta test provided an opportunity to gather feedback and make improvements before conducting a larger randomized controlled trial of the program.