Word to the wise re: Telemarketing scams

Just read this great suggestion: "If you get a call from a number you absolutely don't recognize. DON'T ANSWER...period. Again, don't pick up unless you recognize the number. I find this method decreases the calls over time & then they stop. I heard there is even calls that come in to find out what time a day someone is home and what age or gender answers. Don't answer. If it is a person or business that needs to get you they will leave a  message or send you mail. Whether it is crime, scams, sales, or surverys...who needs it! You increase the cycle when you answer."