The National Do Not Call Registry gives you a choice about whether to receive telemarketing calls at home. Most telemarketers should not call your number once it has been on the registry for 31 days. If they do, you can file a complaint at this Website. You can register your home or mobile phone for free.

The one drawback is that the unscupulous marketers and scam artists pay absolutely no attention to this list. However, by registering your number(s) you can avoid the legitimate marketers.