How to back up the address book in Apple's mobile phone to a new mobile phone?

You can use Apple's icloud to back up the address book, and back up the address book in the old Apple phone to the new Apple phone. The operation steps are as follows:

1. Find and open the settings app in your mobile phone and enter the settings page.

2. On the Settings page at the top of the screen, you can see the logged-in icloud account.

3. After clicking into the account, you can see the icloud function button.

4. Click on the icloud page to see the usage of icloud, and see which apps use icloud for backup. Select the address book to be backed up, and click the circle on the right to open the backup.

5. Use the new Apple mobile phone, open the settings function app, find the function button that needs to log in to icloud on the settings page, and click Enter.

6. Enter the same apple ID account and password in the new mobile phone, and click Next.

7. When logging in to icloud, a prompt button will appear at the bottom of the screen. Click Merge to complete data backup to the new mobile phone.