What will happen if the phone is muted for no reason and returned?

First of all, let's talk about what is to restore the factory settings. Restoring the factory settings of the mobile phone is to clear all information on the mobile phone, including software, pictures, video materials, text messages, all data of contacts, as well as junk files and caches on the mobile phone. Then the mobile phone is restarted and returned to the first startup state, that is, all files in the mobile phone are formatted. At this time, the mobile phone will become very smooth, just like when it was newly bought, and the speed will be very fast. However, it should be noted that restoring the factory settings will delete all files in the mobile phone, so before operating this factory setting, all useful files in the mobile phone need to be backed up to other devices to avoid losing important files.