The current protocol is a pilot study in women with hormone receptor positive breast cancer who are beginning adjuvant endocrine therapy, the purpose of which is to assess the feasibility of a two-way text messaging application, with goals for a larger randomized control study to assess if the application will increase adherence and therefore improve disease free survival. This application includes daily text message medication reminders and periodic assessment of side effects and barriers to medication adherence and simultaneously offers assistance for treatment related issues. The investigators will collect information on QOL and financial burden during the 3 month period and will correlate these metrics with adherence. This larger randomized control study would be the first such interventional study to increase adherence with adjuvant endocrine therapy in breast cancer in the US. Our larger randomized control trial would provide the first longitudinal prospectively collected information on QOL, financial burden and adherence over the entire 5-year treatment period in the routine clinical practice setting.