How to delete all address books on Android phones

1. Unlock the phone, enter the main interface and select "Dial".

2. Enter the dialing interface and select "Contact".

3. Find the contact information to be deleted in the address book, and then press and hold the text box.

4. Enter the multi-choice mode, click the contacts to be deleted in batch, and click "Delete".

5. If you want to delete all contacts, click Select All to delete all directly.

How to set the blacklist of mobile phones:

1. In our mobile phone call record, we click on someone's call details.

2. Click "Join Blacklist" below.

3. At the prompt, continue to click "Add Blacklist" to add.