Joke Collection Website - Public benefit messages - Recently, mobile phones have inexplicable notification sound effects.

Recently, mobile phones have inexplicable notification sound effects.

Maybe the phone cache is too large.

I suggest that I rule out whether it is the firmware version of the mobile phone first. The most direct way is to press the power button and the volume down button after the phone is turned off, and then press them together to see if I can enter the recovery mode of the phone. If possible, it is suggested that I click Yes in the lines of restoring the factory settings of the mobile phone and clearing the cache of the mobile phone, and then restart the mobile phone. The power button is confirmed and the volume is adjusted up and down.