A three-arm randomised controlled trial conducted in Zambia’s Lusaka Province compared two short message service (SMS) campaigns and routine access to counselors through SMS, assessing the impact of these interventions on self-reported and verified uptake of voluntary medical male circumcision (VMMC) over six months. The results are reported in this article, which is part of a supplement to the Journal of Acquired Immune Deficiency Syndromes, about interventions to create demand for VMMC.