This number is used for Mitt Romney's presidential campaign.  I got a call tonight telling me to stay on the line and I would be connected to a conference call with Mitt.  I hung up but Mitt wouldn't drop the line.  He was answering an elderly woman's question on Social Security when I finally hung up the phone for about 20 seconds and that released the line.  I thought these robo-type calls were supposed to release the line immediately when somebody hangs up.