What about VOIP?
I guess it is only mobiles that are protected because you have to pay for your minutes?
Why do I think the solution to the ever falling number of landlines making it harder for people to annoy us will be AT&T and Verizon announcing a new "sponsored calling" service available to corporations and non-profits, which allow them to pay for the subscriber end of the call to allow mobiles to be telemarketed, politicked and push polled to their little black hearts' content?