Background The growth in mobile technology access, utilization, and services holds great promise for facilitating HIV prevention efforts in Malaysia. Despite these promising trends, there is a dearth of evidence on the use of mobile health (mHealth) platforms to address the HIV prevention needs of Malaysian men who have sex with men (MSM). Objective The goal of this study was to gain insights into (1) the access and utilization of communication technology (eg, landline phone, internet, and cell phone), (2) the acceptability of mHealth-based interventions for HIV prevention services, and (3) preferences regarding the format and frequency of mHealth interventions among Malaysian MSM. Methods A cross-sectional survey of 376 Malaysian MSM was conducted between July 2018 and March 2020. Participants were recruited using respondent-driven sampling in the Greater Kuala Lumpur region, Malaysia. Participants completed a self-administered assessment of participant demographics, HIV risk-related behaviors, access to and frequency of the use of communication technology, and the acceptability of mHealth for HIV prevention. Results Almost all participants owned or had access to a smartphone with internet access (97.9%) and accessed the internet daily (99.2%), mainly on a smartphone (88.8%). Using a 5-point scale, participants on average used smartphones primarily for social networking (mean 4.5, SD 0.8), followed by sending or receiving emails (mean 4.0, SD 1.0) and searching for health-related information (mean 3.5, SD 0.9). Further, the results indicated the high acceptance of mHealth for HIV prevention, that is, receiving HIV prevention information (91.8%), receiving reminders to take medications (89.4%), tracking sexual activity (81.4%), tracking drug use (74.7%), and monitoring drug cravings (74.5%), with the most preferred method being the smartphone app for all activities. Conclusions The findings from this study provide support for developing and deploying mHealth strategies for HIV prevention in MSM by using a smartphone app, which are crucial for a key population with suboptimal engagement in HIV prevention and treatment. Conflicts of Interest None declared.