How to delete all the phones in the address book in Apple 6 mobile phone at one time?

You can delete contacts in batches through iCloud in your mobile phone or by logging in to iCloud official website.

To delete the address book in batches:

For versions 1, ios 1 1 and above, click phone settings, enter an account number, and click iCloud.

2. Turn off the address book switch.

3. When closing, the page will prompt that if you choose to delete from my iPhone, you can clear the address book.

4. You can also log in to iCloud official website through your computer.

5. After logging into the account, select the address book.

6. Contacts will be displayed on the left. Press and hold the Ctrl /Shift key of the computer keyboard, and click the contact to be deleted. After selection, it will be displayed on the right.

7. Click on the gear (setting button) in the lower left corner and select Delete.

8. After reconfirming, click Delete.