[jaredhallen]

Interesting. I seem to have had the opposite experience. I tried the method you're suggesting for a while, but there always seemed to be a flurry of additional calls after answering one. I thought that maybe the answered call was noted somehow as indicating that the number was valid. Completely anecdotal, just my $0.02.

[r4cec4r]

It seems to depend on the business that's doing the calling I guess. I had one that I answered and the person literally laughed at me and hung up so YMMV.