Background. Nigeria has one of the lowest antenatal care (ANC) utilization rates compared to other low- and middle-income nations. In order to ensure a positive pregnant experience, the World Health Organization recommends at least eight ANC visits during pregnancy. This study intends to examine the impact of a mobile phone-based voice message intervention on ANC use in Lagos, Nigeria.Methods. In this cluster-randomized experiment, primary healthcare centres were divided into five intervention and five control groups using multistage simple random sampling. The intervention consisted of a weekly voice message transmitted through mobile phone from the time of recruitment in the first trimester until two weeks postpartum. Attending at least eight ANC visits before birth was the primary outcome. STATA v17.0 was used to conduct descriptive and bivariate analyses as well as multivariate linear models to calculate crude risk ratios.Results. 458 women participated. All intervention group women (269 women, or 58.7% of the sample) received the text message. These ladies were mostly married, Christian, had several children, and had completed high school. Women who received the intervention were more likely to attend eight ANC visits.Conclusion. A voice message-based intervention can boost ANC utilization, according to the conclusion. This contributes to the existing body of information about the influence of mHealth treatments on maternal health outcomes and serves as a useful tool for ensuring that no woman is left behind.