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The intervention consists of standard care and the app (called Interaktor) for routine symptom reporting of common symptoms regarding fatigue, emotional distress, sleep, pain, loss of appetite, hot flashes/sweating, edema, and sexual health, in combination with health dialogues with a study-specific nurse. The reports are made weekly during the first month and thereafter as mutually agreed, at minimum once a month for six months, with instant self-care advice in combination with supportive care with a study-specific nurse. At health dialogues with the study-specific nurse, the patient-reported assessments in the app will be used to discuss the individual's current situation and to plan eventual additional actions needed.

The intervention will last for 6 months.

In the app (Interaktor), the patients will report frequency and distress on common symptoms and concerns.

Free text comments will also be possible to make to cover the patients' other potential needs. Information about the concerns will be included in the app containing; a) general information about why they have the side effects and what it means b) evidence-based advice about self-management; c) when they should contact health care providers, and d) further information linked to reliable documents, web pages or YouTube videos.

Supportive Care delivered from a study-specific nurse. During the health dialogues with a nurse, the patient-reported assessments in the app will be used to discuss the individual's current situation and needs and to plan eventual additional actions needed such as support from a physiotherapist, social worker, dietitian or if a visit to the physician if needed. This is documented in the patient's journal.

The participants in the control group will only receive standard care in the secondary care setting. Usually after ended primary treatment the follow-up is determined based on the severity of the tumour, the received postoperative treatment and the patient's general health status. Patients should be offered a yearly follow-up for at least five years where the patients are made a part of the decision-making process of the structure of the follow-up. All patients are allocated a contact nurse with a telephone number to contact when needed.

The Acceptability e-scale is a questionnaire with 6 items that evaluate the acceptability of a system. Items are scored using a Likert scale ranging from 1-5 with higher values indicating higher acceptability.

The System Usability Scale is a questionnaire with ten items that evaluate the usability of a system. Items are scored using a Likert scale ranging from 1-5. only question 5 and 10 will be included in this study.

To assess acceptability and feasibility, the participants in the intervention group and the study-specific nurses will be interviewed about their experience of using the Interaktor system and about the health dialogues.

To evaluate the feasibility of the future trial methodology, enrollment, recruitment, and withdrawal rates will be documented. Other feasibility measures include completion rates and missing data in each study questionnaire. Objective measures will be extracted from the logged data in the app, i.e., the number of reports sent (adherence), self-care advice viewings, and notes from the study-specific nurses.

The questionnaire has 45 items and evaluates specific breast cancer symptoms related to treatment such as fatigue, apatite and sexual health. Items are scored using a Likert scale ranging from 1-4 with higher values indicating more burden of symptoms.

The questionnaire has 30 items divided in five functional scales (physical, role, emotional, social, and cognitive), eight symptom scales (fatigue, nausea and vomiting, pain, insomnia, appetite loss, constipation, diarrhea), financial impact of the disease, and a global health status/QoL scale. Questions are scored using a Likert scale ranging from 1-4 with higher values indicating lower QoL.

The questionnaire has five items measuring the ability to read and understand information regarding health, disease and healthcare.

The EQ-5D-5L is a descriptive system that comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.

The PAM-13 questionnaire has 13 items measure knowledge, skills, beliefs, and confidence in managing health and healthcare.

The SOC-13 questionnaire measure overall coping ability.