Why is the phone book, SMS and settings of Samsung not4 all in black and white? How to convert them into white characters on a black background?

From your description, I suggest you:

1. Observe after uninstalling the recently installed third-party software, such as mobile phone housekeeper, dial-up assistant and so on.

2. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore factory settings (enter phone settings-reset/privacy/private-restore factory settings).

If the problem of restoring factory settings still exists, it is recommended to send the mobile phone to the nearest Samsung service center for testing. Please visit the address and contact information of the service center:

. Samsung . com/support/service locations . ASP

Samsung knows to provide you with high-quality solutions and answer your questions attentively, hoping to get your satisfactory evaluation.