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This phone can't delete the lock screen signature, and the display is very weak.
Does the subject want to ask, "What if the mobile phone can't delete the lock screen signature and the display light is on?" ?

1. First, in the setting menu of the mobile phone, find the lock screen, password and similar options, and click Enter.

2. Secondly, in the lock screen settings, look for the lock screen signature and similar options.

3. Finally, after entering the lock screen signature option, you can delete the existing lock screen signature and edit it into a light color.