Post-abortion family planning (PAFP) is important to reduce subsequent unintended pregnancies • There is limited evidence for mobile phone-based interventions (mHealth) to increase contraception use • Our formative research indicated that only 40% of women adopted effective PAFP (pill, intra-uterine device, implant, or injectable) at Marie Stopes International (MSI) Cambodia clinics • The objective of the MObile Technology for Improved Family Planning (MOTIF) trial was to assess the effects of a mHealth intervention to support PAFP in Cambodia The MOTIF intervention significantly improved use of effective contraception at four months post-abortion, in particular long- acting methods • Additional mobile phone-based support for PAFP should be considered in addition to existing abortion care services.