Title: Be sure this is what you want!
Review: I didn't purchase one of these, because I found out something useful before I did. I had the blocker service on my phone, purchased through the telephone company. It did a great job of filtering out calls from telemarketers. But, what I didn't know was, it also filtered out calls from phone cards and all 800 numbers. I have some relatives and friends that have either phone cards with limited minutes or an 800 number they use. The blocker service I had wouldn't let these calls through. I found out from the telephone company that the TeleZapper would do the same. So, if you know someone you would like to hear from that uses these things, just be aware that they wouldn't be able to get through if you put the TeleZapper on your line.
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