A red line appears on the screen of Samsung mobile phone. What is the reason?

This is caused by the instability of the mobile phone system.

Solution:

Method 1: Enter the phone settings-system-developer options-uncheck the strict mode-restart the phone and the settings will take effect, you can remove the red line display on the screen .

Method 2: Back up mobile phone data (phone book, text messages, multimedia data, etc.) and try to restore the phone to factory settings (Settings - Reset - Restore factory settings).

3. If the problem persists, it is recommended to bring the three-guarantee voucher and send the phone to the nearest Samsung service center for testing. Red lines appear on the screen of Samsung mobile phones