The research was done in 4 stages. The first phase (First encounter with cases/0th month); Informed Voluntary Consent Form (ANNEX-1), Individual Information Form (ANNEX-2), National Breast Cancer Screening Program Knowledge Test (Pre-test) (ANNEX-3) were applied. They were allowed to watch the animation video (ANNEX-4) via social media (Whatsapp).

In the second phase (month 1); National Breast Cancer Screening Program Knowledge Test (Interim test) (ANNEX-3) was applied. They were asked to use the MEKTUP mobile phone application (ANNEX-5) by being trained.

In the third stage (month 2); A reminder message was automatically sent to them to participate in breast cancer screenings with the MEKTUP mobile phone application (ANNEX-5)

In the fourth stage (month 3); National Breast Cancer Screening Program Knowledge Test (Post-test) (ANNEX-3) and Research Evaluation Survey (ANNEX-6) were applied. A reminder message was sent with the MEKTUP mobile phone application (ANNEX-5).

An animation video scenario and MEKTUP mobile phone application were prepared by the researchers in light of the literature, in line with the "National Breast Cancer Screening Program" and by taking expert opinions.

After the informed written consent was received from the women who agreed to participate in the research, the Descriptive Information Form prepared by the researchers and the National Breast Cancer Screening Program Knowledge Test were applied as the "Pre-Test" via e-mail or social media.

The Descriptive Information Form contains 17 questions about age, marital status, education level, employment, income status, last menstrual period, smoking, a family history of breast cancer, and breast cancer early screening program.

National Breast Cancer Screening Program Knowledge Test: This test was prepared using the literature and the National Breast Cancer Screening Program .The test includes a total of 20 questions, with 10 correct and 10 incorrect answers. If an individual answers all questions correctly, they score 20 points.

The National Breast Cancer Screening Program Knowledge Test was applied to the women who watched the animated video a second time, one month later, as the "Interim Test" via. Immediately after the interim test, the participants were interviewed and asked to download the MEKTUP mobile phone application from the Google Play Store and register. The mentioned video was sent to the participants via WhatsApp.

Animated Video: An animated video scenario was prepared by reviewing the literature and based on the "National Breast Cancer Screening Program". Written expert opinions were received on both the video design and information content. Three characters (a mother, a daughter, and a doctor) were included in the animation design. In the scenario, the doctor provided information on how, when, and where to perform BSE, undergo CBE, and have mammography, and breast cancer symptoms. (Animated video)

The National Breast Cancer Screening Program Knowledge Test was applied to the women who watched the animated videoa second time, one month later, as the "Interim Test" via. Immediately after the interim test, the participants were interviewed and asked to download the MEKTUP mobile phone application from the Google Play Store and register. The mentioned video was sent to the participants via WhatsApp.

The Breast Cancer Screening Warning Program (MEKTUP) mobile phone application, designed by the researchers in line with the "National Breast Cancer Screening Program" and having a reminder feature, was employed as a data collection tool. The mobile phone application automatically sent reminder messages in the "Reminder" section to menstruating women, according to the date of their last menstruation, and to non-menstruating women, according to a date they determined, to perform BSE once a month, to undergo CBE once a year, and to have mammography once every two years.