How do I opt in to the option? January 03, 2024 03:19 Updated You can SMS “4” to “1218” to check your option status and follow the onscreen instructions to opt in or out of the option. Related articles How do I opt out of the option after having opted in? What is the Option not to Receive International Calls? Is the option free? What happens when I opt in to the option? How soon will the process of opting in or out of the option take effect?