As soon as the headphones are plugged in, songs will be played or voice assistants will appear. What if the voice assistant is not turned off in the settings? According to your description, it is suggested that after backing up the important data files in your mobile phone, go to Settings-Other Settings-and click Restore your mobile phone. After the above attempts, the problem still exists. You can take your mobile phone to the OPPO customer service center for free testing. You can quickly find the address and telephone number of OPPO Customer Service Center in the following ways:

1. Enter the OPPO official website-Service-Service Network for inquiry; 2. Enter OPPO+- Home-Recommendation-Customer Service-Service Network.