Interesting, call back after blocking my number gets a "hello" followed by a noise then a click and hang up. The reason this is interesting is because I just made a call back for another number and got EXACTLY the same experience and the "hello" sounded exactly the same! That number was a Pennsylvania number.
Here's the thread where I posted:
http://800notes.com/Phone.aspx/1-717-321-1215#p860671362551042053
Smells like some kind of scam. Good number to block.
These dirt balls called my number 13 times in five minutes. And our great government does nothing to help us. Its we special interests now, not we the people. This should not be allowed but with weak laws and politician's pockets stuffed with special interest money we the people have 0 chance of this being fixed. Very sad!!!!!