How does Apple phone check where the number is saved?

Specific operation steps:

1.iphone6 After unlocking to the home screen page, find and open your application phone.

2. After entering the phone page, find the last call and select the number to save, for example,152-xxxx-1221.

3. Click the blue letter I after the number152-xxxx-1221to edit.

4. Enter the detailed setting page with the number152-xxxx-1221,and click New Contact.

5. Edit the number data to be saved and click Finish to save the number.

6. After saving the number, switch to the address book page and click the search bar at the top of the screen.

7. Enter the saved number information in the address book.

8.iphone can check the number saved in the phone address book at any time.