How to delete encrypted mobile phone contacts?

The method for canceling the encryption of vivo mobile phone contacts is as follows:

1, Funtouch OS 3.0 and above systems cancel contact encryption.

Enter the mobile phone-long press to encrypt the contact-decrypt-enter the privacy password to decrypt. After decryption, your phone records and messages with this contact will be decrypted.

2. The contact encryption is cancelled for systems below 2.Funtouch OS 3.0.

Enter I housekeeper-privacy space-communication-long press contact-decryption. After decryption, your phone records and messages with this contact will be decrypted.