Hello, my mobile phone model I9802 can't automatically lock the screen. what can I do?

According to your description:

1. It is possible that the mobile phone has set the automatic screen closing time. I suggest you check whether the phone has been set for a long time to automatically turn off the screen, and then try to reset the time: setting-display-automatic screen off-15 seconds to see if it is back to normal;

2. If you still can't lock the screen normally, I suggest you check whether the third-party software is newly downloaded and installed on your mobile phone. It may be that the software is incompatible with your mobile phone, so I suggest you try to uninstall it (Settings-Application Manager-Select Download-Uninstall).

3. If it doesn't return to normal, I suggest you back up your mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings (Settings-Reset-Restore Factory Settings). If the problem still exists, I suggest you take the three-guarantee certificate of your mobile phone and send it to the nearest Samsung service center for testing. Please visit the specific service center address:

/servicelocation

I hope I can help you and wish you a happy life!

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