[header] How to cancel a sports illustrated subscription [title] Call the si customer service line at 1-888-806-4833. [step] You can call this toll-free number from any phone. However, if you are, you will need to first dial your country's exit code, then the customer service number. 
[title] Tell the customer service agent that you would like to cancel. [step] When a customer service representative comes onto the line, let them know that you are calling because you no longer want to have sports illustrated delivered in your mailbox.