This study helps women with breast cancer to stick to their hormone medicine routine. Sometimes, taking medicine as the doctor says can be hard, but it’s important to do it right for the treatment to work well. The study tests if sending text messages or talking on the phone can help women remember to take their medicine. There are four groups: one gets text reminders, another gets phone help, the third gets both, and the last gets regular care. The study lasts up to 24 months.

• Participation involves regular reminders via text or phone calls for up to 9 months.
• Patients need a smartphone, but one can be provided if necessary.
• The study provides support for medication adherence, which is crucial for effective treatment.

Women eligible for the study are those diagnosed with certain stages of breast cancer, have started or are about to start hormone therapy, and are willing to use a smartphone and a medication monitoring system. Participants will be supported with free smartphones if needed and will use a system to track their medication use.