After the android encrypted mobile phone is complete, there will be frequent noises in the standby mode for two minutes. android 2 minutes

After the android encrypted mobile phone is complete, there will be frequent noises in the standby mode for two minutes. android 2 minutes
This sound effect is automatically added in the code to remind the end user to enter a prompt message for the PIN, which also marks the completion of the encrypted mobile phone action.
The specific location is in alps \ packages \ apps \ Settings \ src \ com \ android \ settings \ CryptKeeper. java
In the policyuser method, the playSoundEffect () method of AudioManager is used. If you do not need this, you can comment it out.
Why is there a speaker noise when the mobile phone is in standby mode?

Chinese mobile phone? You are too one-sided. Have you used a Chinese BBG music mobile phone? Have I used a Chinese OPPO music mobile phone? Have you used a Chinese HTC smartphone ?..... In addition, OPPO is only a subsidiary of BBG.

What should I do if there is a noise in my cell phone when the phone is on standby?

If the noise on your phone is not very high,
In addition, there is noise only when the keyboard light is on,
Otherwise,
That is normal,
Many models of MOTO are like this,
Because the MOTO mobile phone keyboard has high-frequency vibration,
I use MOTO, and so on.