Novel Mobile Device Application to Improve Adherence

Inclusion Criteria: * Enrolled (consented) prior to hospital discharge from heart transplantation or within one month after discharge, but not later than 3 months post-transplantation; * English as primary language or fluent in English; and * Informed consent and assent obtained. Exclusion Criteria: * Positive donor-specific cytotoxicity requiring different immunosuppressive regimen from standard care; * Inability or unwillingness of a participant to give written informed consent or comply with study protocol; * Re-transplant or multi-organ transplant recipient; * Condition or characteristic which in the opinion of the investigator makes the participant unlikely to complete at least one year of follow-up; or * Current participation in other research studies that would, or might, interfere with the scientific integrity or safety of current study (e.g. by interference with immunosuppression management guidelines and study end-points).