Argh I hate that! Do they even bother talking at all or just call and nobody's there when you answer? You can register both your home and cell with the National Do Not Call Registry: https://www.donotcall.gov/default.aspx or http://www.ftc.gov/donotcall You can also file a complaint at that site. Charities, debt collectors and political organizations are exempt. You can also try a reverse number look-up at anywho.com. you might be able to figure out who it is. Good luck.