The mobile information application was downloaded from the Android market and installed on the patients' phones, and the patients were taught about how to use it. The patients were given a short information brochure on the use of the mobile application. One week after the surgery, the patients were called and reminded about the use of the application. Three weeks after the surgery, data were collected through telephone interviews using the Patient Follow-up Form, Anxiety, Distress and Quality of Life measurement tools, the Patient Information Satisfaction Questionnaire, and the Mobile Application Evaluation Form.

The patients received routine care and training in the clinic, and no additional intervention was applied. Three weeks after the surgery, data were collected through telephone interviews using the Patient Follow-up Form, Anxiety, Distress and Quality of Life measurement tools, and the Patient Information Satisfaction Questionnaire

The mobile application had three sections: Information forum (I), Personal forum (notebook and reminder) (II) and Ask the Researcher (messaging) (III). The information forum (Figure 2) is a section that enables patients to access related articles, pictures, and videos. The personal forum is a section that allows patients to create their notes and use the necessary reminders. Ask the researcher section allows patients to communicate with the researcher via messages.

The participants could download the mobile application with the name "Breast Cancer Surgery Information Guide" from the Google Play Store and install it on their phones. Users who were authenticated by the researcher were able to access the content with an e-mail and password.

This scale was developed by Roth et al. (1998) to measure psycho-social distress in cancer patients. It consists of the visual analog scale that individuals can apply on their own, consists of only one question, and is used to evaluate the stress situations patients have experienced in the last week and a list of problems. There is a thermometer with numbers from 0 to 10 on the scale. On the distress thermometer, a score of 0 indicates that the individual has never experienced distress, and a score of 10 indicates that he or she has experienced distress at the upper limit.

The HAD is a self-report scale used to diagnose anxiety and depression in a short time and to determine the risk group in patients with physical illness and/or applying to primary health care services. Only the Anxiety subscale (HAD-A) was used in this study. Anxiety subscale consists of 7 items (1st, 3rd, 5th, 7th, 9th, 11th and 13th questions). Items 1, 3, 5, 11, and 13 show gradually decreasing severity. The score that can be obtained from the HAD-A ranges between 0 and 21 (min.-max.).