How is the operation panel darkened when Samsung mobile phone sends a message?

According to your description, I suggest you try the following methods:

1. Restart the phone.

2. Settings-Application Manager-Swipe Screen Options (All)-Find Information-Click Enter and try to clear the data.

3. Try to replace another SIM card.

4. Check whether the mobile phone is equipped with security guards or third-party SMS software, and test it after unloading.

5. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings.

If the above method still fails, please send the equipment to Samsung Service Center, and the engineer will check the machine and deal with it.

Please click the following link to find out the specific location of Samsung Service Center:

. Samsung . com/support/service locations . ASP

If you have any comments, suggestions and comments, please click: support.samsung.com.cn/survey.