You can now place your home and mobile telephone numbers on a free, national “do not call list” of households that do not want to receive telephone sales calls, by logging on to http://donotcall.gov or calling 1-888-382-1222.

Telemarketers who call numbers on the list after Oct. 1 will face penalties of up to $11,000 per call, as well as possible lawsuits from consumers and state attorneys general.