How to delete information with OPPO mobile phone?

The method of deleting information in batch by OPPO mobile phone: 1. Delete the existing contact information: enter the information application, click Edit, check the conversations of one or more contacts as needed, and click Delete to delete all the conversation information of the selected contact; 2. Delete classified information (including notification information and strange number information): enter the information application, click notification information or strange information, and then click Edit. After viewing the call records of one or more numbers as required, click [Delete] to delete all the call information of the selected number.