IQOO 7 models don't know which software is sounding in the mobile phone, so you can check it in the following ways:

1, you can slide at the bottom of the mobile phone desktop to bring up the card background, and clear one program at a time.

2. If there is no program running in the background and there is still sound playing, you can clean up the garbage cache in the I housekeeper of the mobile phone, speed up the background program cleaning with one button, and restart the use of the mobile phone to see if there is any improvement;

3. Check whether it is the latest version in the phone settings-system upgrade interface. If there is a push notice about the new version, it is recommended to update it to the latest version in time.

4. Enter Settings-More Settings/System Management-Restore Factory Settings/Backup Reset-Try to restore all settings (it is recommended to back up important data such as contacts, information and pictures in the mobile phone first, cancel the account of vivo and third-party software, and programs such as WeChat may need to log in again).