Advances in Preventive Care Delivery through WhatsApp, SMS, and IVR Messaging in High-Need Populations

In high-need populations—characterized by limited healthcare access, low health literacy, and elevated risk for chronic and infectious diseases—preventive care remains a critical yet underutilized service. The proliferation of mobile communication technologies presents new avenues for enhancing preventive healthcare delivery through widely accessible channels such as WhatsApp, Short Message Service (SMS), and Interactive Voice Response (IVR) messaging. This paper explores recent advances in the application of these mobile messaging platforms for preventive care outreach, engagement, and education in underserved and marginalized communities. Drawing on empirical studies, program evaluations, and pilot interventions conducted across diverse settings in Africa, South Asia, and Latin America, this review synthesizes the design, deployment, and effectiveness of messaging strategies in improving vaccination uptake, maternal and child health outcomes, chronic disease management, and screening participation. Evidence suggests that WhatsApp enables interactive health education, peer support, and real-time provider-patient communication, while SMS offers a scalable, low-cost method for reminders, alerts, and behavioral nudges. IVR messaging, particularly effective in populations with low literacy, facilitates inclusive outreach by delivering pre-recorded health messages in local languages and dialects. The review highlights that personalized, culturally tailored, and time-sensitive messaging significantly improves knowledge retention, appointment adherence, and proactive health-seeking behavior. However, challenges persist in ensuring message clarity, combating misinformation, addressing data privacy concerns, and maintaining user engagement over time. Integration with community health worker networks, feedback loops, and public health systems is critical for maximizing impact and ensuring sustainability. This paper concludes that WhatsApp, SMS, and IVR-based messaging systems are powerful tools for democratizing preventive care and closing equity gaps in healthcare delivery. Their continued effectiveness depends on human-centered design, local context adaptation, and alignment with broader health system strengthening strategies. As mobile phone penetration deepens across the globe, these messaging technologies offer scalable solutions for delivering timely, relevant, and actionable preventive care to those most in need.