STAMP+CBT mHealth for Cancer Pain

Inclusion Criteria: \- PILOT COHORT * Age ≥ 18 years * Patients diagnosed with an active cancer diagnosis, either undergoing active cancer treatment or receiving treatment for an advanced cancer or are receiving palliative care * Treatment managed at participating clinic (DFCI outpatient palliative care, gastrointestinal cancer center, and DFCI satellite clinic Merrimack Valley or Londonderry) * Chronic pain related to cancer or treatment (\> pain score of 4) * Has an active prescription for at least one opioid medication to treat their cancer pain (i.e. not for post-surgical pain) * Own a compatible smartphone (android) or is willing to use an android device provided by the study team * Completes baseline survey Exclusion Criteria: * Patients in survivorship: patients who have completed their treatment regimens, are not actively receiving treatment for an advanced cancer, or have a cancer that is in remission * Cognitive impairment that would interfere with study participation, as judged by treating clinician * Inability to speak English: the intervention has not yet been translated to Spanish * History of opioid use disorders * Enrolled in hospice * Currently hospitalized * Use of transmucosal fentanyl, given safety concerns and ongoing risk mitigation program required to prescribe these (TIRF REMS). * Pain primarily related to a recent surgery