S7 prompts that the memory is full/insufficient. When it is necessary to optimize the memory, it is recommended that you:

1. Intelligent Manager-Storage Space-Delete unnecessary data and applications.

2. Intelligent Manager-Memory-Background application/self-startup application-Close unnecessary applications.

3. Click the recent task key in the lower left corner of the screen-click the "X" in the upper right corner of the application to be closed/close all below.

4. Transfer multimedia files (pictures/music/videos, etc.). ) From the mobile phone to the SD card or computer.

5. If it is invalid, it is recommended to back up the materials (contacts, materials, photos, etc.). ) and try to restore the factory settings;

If the problem still exists, please go to the Samsung service center and have it tested by a professional after-sales engineer.