This is a multi-site phase II, 2:1 pragmatic randomized trial of 250 participants within the NYU Langone Health (NYULH) and Emory University Medical Center system to evaluate mobile health cardiac rehabilitation (mHealth-CR) in patients who meet clinical criteria for INOCA (ischemia and no obstructive coronary disease on imaging). Participants will be randomized to mHealth-CR or usual care. The study intervention takes place for 3 months which is the time period for most traditional CR programs. The overall study goals are threefold: 1) to evaluate whether an mHealth-CR intervention that includes activity tracking, weekly counseling, and exercise documentation, improves health status (i.e., symptoms, function, and quality of life) in patients with INOCA at 3 months; 2) to evaluate effects of the mHealth-CR intervention vs. usual care on physical activity and exercise capacity, general health status, and depressive symptoms (secondary endpoints). We will also evaluate effects on primary and secondary outcomes at 6 months and 1 year; and 3) to characterize engagement and elucidate any factors that limit engagement.