It can be deleted, but in most cases, the system requires manual deletion to avoid deleting important files by mistake.

1. When you clean yourself, you can look at the specific cleaning contents, such as chat records and pictures.

2. If you have received large files, such as QQ and WeChat, you can selectively delete them.

3, including some video files, unnecessary can also be deleted.

This will be beneficial to the operation of the mobile phone and ensure the speed.