That's an awesome idea! I didn't know that was possible. Can you tell me how you did that? These spam numbers keep bombarding me, even though I don't answer the call unless I recognize the number. I have an iPhone 4 on Verizon.
Got the same call... 1-2 rings and hung up! Don't reply as that confirms your number in case they are using computer to call you ( likely ). I blocked it on my iphone so it won't ring or receive SMS messages from this number anymore!
It makes no difference whether you reply or not. The phone rings . . . it gives no SIT response . . . that confirms the number.
No commercial entity ever calls anyone for any solicitation purposes without the call being computerized.
Blocking the number is the best (and close to the only) thing you can do. Almost better, and the other thing you really ought to do, is to complain to FTC and FCC. Maybe, since they're tracking everybody all over the earth anyway, the NSA can actually do something useful and help shut down operations like this.
Write to your congressman: demand that these snoopers use their snoopage on our behalf.