Do I have to pay to join someone else’s address book?
No, you don’t have to pay to join someone else’s address book.
Regardless of your package, you can have access to as many address books as you’re invited into. The number of address books mentioned in your package is the number of address books you can create.
When you invite someone to share an address book, who doesn’t already have a Contactzilla account, they will be redirected to a sign-up page where they can sign up for the free package (or upgrade if they want to).