Telezapper for annoying Telemarketing Calls

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I know the Federal Do Not Call list alleviated many of these calls, but I still know people that receive unwanted telemarketing calls. I used the Telezapper for awhile with much success. What it does is emit tones similar to those you hear when you call a number that has been disconnected, so the computer which is making the automated calls is tricked into thinking your number is no longer valid and removes your number from the list. Pretty cool, huh? I just let a friend borrow it for awhile. She just gave it back to me this morning and now I will let another friend borrow it. She receives at least one telemarketing call per hour, it's crazy!