After a month or two, you can remove it...and lend it to someone else. The bulk of the telemarketers (as well as the Do Not Call exempts) will be gone.
TeleZapper TZ 900 - Privacy Technologies
Makes a loud, annoying tone when used with a cordless phone
I bought my TeleZapper for use with a new Motorola 2.4 GHz Digital cordless phone. Whenever I press the "ON" or the "HANDS-FREE" buttons on the handset, the phone emits a loud and annoying beep. This makes it very difficult to hold the handset close to you ear when you make or take a phone call. When I disconnect the TeleZapper, this loud tone is not present.
Anyone else have this problem?
Privacy Technologies - TeleZapper TZ 900
This really works!
I must admit, I didn't expect it to, but it really does! My unsolicited calls *almost* disappeared. BTW, I do not have a problem with a "beep" noise when I pick up the phone -- it just sits there and does its thing. If only I had one for the spam in my email inbox...