[header] How to stop telemarketing calls [title] Sign up for the national do not call registry. [step] Taking advantage of this free service can help you reduce the number of unwanted telemarketing phone calls you receive on both your landline and your cell phone. You can sign up for the service online at donotcall. Gov, or by calling the federal trade commission. 
[substeps] Telemarketers are supposed to stop calling your number within 31 days of your registration. This service will not prevent all unwanted calls.