There are too many softwares downloaded and installed by OPPO mobile phone and too many data caches, which may lead to insufficient storage space and slow operation of the mobile phone. If your phone is out of storage space, you can try the following methods to free up space. (1) coloros11and above: enter "Settings >; (about this machine) > storage space > cleaning ",including photo cleaning, video cleaning, application uninstallation, application slimming, document cleaning, cloud migration and other operations, is simple and quick. (2)ColorOS7 and above systems: "Mobile Manager" APP> Cleaning Storage, which can be used for photo cleaning, video cleaning, application uninstallation, application slimming, document cleaning, cloud migration and other operations, and is simple and quick. (3)ColorOS7 and above systems: enter the "file management" APP> clear storage/space > one-click cleaning (safe cleaning) to clear the file data. Tips: If the above methods can't solve your problem, please back up your mobile phone data and bring your mobile phone, invoice and warranty card to the local OPPO customer service center for testing. Due to different models and system versions, the operation path may be slightly different, please refer to the actual operation interface display of the mobile phone. This answer applies to all OPPO models.