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Which mobile phone memory files can be deleted?
We can only operate two folders, data and system. Of course, neither folder can be deleted.

Data/data can be manipulated. Under this folder are SMS, call records and qq data.

The system /app is a system application, just don't delete it casually.

System/Font This is a font file, and beautifying fonts is operated in this folder.

System/lib driver folder, please make sure to delete only files you know.

If there is a system/preloaded folder, delete it directly.

You can delete the system/media directly.

You can expand your system, take a screenshot, let me have a look.