A randomized RCT will be conducted with kidney transplant patients identified as hypertensive (>129 SBP following KDIGO guidelines) via medical history. Those identified as being nonadherent for 4 weeks during the first month post enrollment (adherence score <0.85) will be eligible to participate in the second phase. Participants in the second phase will be randomly assigned to standard care (SC) + attention control or the mHealth program plus SC.