Anyone ever tried Telezap?

[Redwingsguy]

I just saw it on a commerical, its supose to "zap" your phone number from telemarketer databases when they call you, so overtime you'll have less and less calls.

Now how would this work?! and does it work?

 

[SDY13]

I seen something simaler at the local K-Mart.I believe was 49.99 I just glanced at it and wondered the same thing.