Understand that some calls are not covered. Once your number has been on the registry for 31 days, most telemarketing calls will stop. However, you still may get:
calls from — or on behalf of — political organizations, charities, and telephone surveyors;
calls from companies with whom you have an existing business relationship. A company may call you for 18 months after you make a purchase or three months after you submit an inquiry or application. However, if you request that the company place your number on its own do-not-call list, it must honor your request. You should keep a record of the date you make the request;
calls from companies you’ve given permission to call