A Great Fun membership can be canceled by phone, mail, email or online, according to the Great Fun terms and conditions. The right to cancel clause lists the ways in which a membership can be cancelled, and it's listed under item 10 of the contract as of June 2015.
The phone number to call and cancel a Great Fun membership is (877) 488-9480, and the address for membership cancellations is P.O. Box 41248, Nashville, Tennessee, 37204, Attn: Membership Department. The email address is firstname.lastname@example.org. One other way to cancel an account is to login to a Great Fun account, navigate to the Customer Center page and click on the Cancel link.