I just got a call  too on my cell, I called it back from a landline and it says "Hello, please press 1 if you would like to be placed on a do not called list"  I stayed on the line and it just keeps repeating same message!  what a way to waste peoples time!

Great idea, but most times there is no one on the other end.  Call your local phone company, they are selling blocks of phone numbers.  Do not answer unknown calls, if its important they will leave a message.  I add the phone number to my address book, and then turn off the ringer.

Never press any other the numbers, ignore the phone call

Start calling your local hone company and complain about them selling your phone number in blocks

I filed complaint with the FCC for this robo-call:   http://www.fcc.gov/complaints 
I received a call from 708-529-4739 at 4:00 p.m. CDT today.  It was a robo-call advising me I could save on my electric bill - just press "5" now to be connected to one of our friendly representatives.  I think they called me two weeks ago (yes, I filed a complaint with the FCC that time, too).