This paper presents a randomized controlled trial involving parents in Bogotá, D.C., and nearby cities to encourage the completion of their daughters' HPV vaccine schedule. The experiment employed decision aids through a text message campaign with two behavioral components: ownership reminders, soft-default options, or both. The results showed the soft-default option had a similar effect to the treatments that combined the message with the ownership reminder. Particularly the impacts of these messages go from 7.96 percentage points to 9.13 percentage points compared to 8.63\% of the vaccination rate in the control group. However, there is evidence that soft-default options have different impacts than the treatment that only sent the ownership reminder because the effect of this last treatment is 4.62 percentage points. These results suggest that behavioral-based SMS interventions effectively increase the uptake of the second dose of the HPV vaccine and can be adopted as a tool by the Health Secretariat for boosting vaccination rates.