[jrockway]

I think it's easy, right? Forward your number to a voice that says, "to call me, please type your credit card number on the keypad. a charge of $2 will apply." If they pay, you connect the call. If they don't pay, the call disconnects. Easy.

Nobody will call you, of course, including spammers.

[SketchySeaBeast]

Why not just not have a phone line, instead of inexplicably paying for a service to not have a service?

[jrockway]

I think the point is to send a message.

[SketchySeaBeast]

And that message is "Don't call me."

[13of40]

How about "Please press 7 to prove you're not a robot."

[dhimes]

or:

"Please enter the result of 7 modulo 5 to prove you are somebody I want to talk to."

[towndrunk]

My wife would never be able to call me. :)