You can delete address books that you no longer need or require, which is a good habit to get into as it keeps your address book lists free of clutter.
Deleting an address book also clears out the contacts that belonged to it - but it doesn't remove those contacts from the 'All contacts' address book.
Deleting an address book
- Go to Contacts from the navigation bar to display your address books
- Use the check boxes to the left of each address book to select ones you want to delete
- Select Delete.
You're then prompted to click Delete again to confirm this action.