My cell and landline have been getting increasing robocalls. The ones to my cell have randomly generated caller id's that are near my own number. One day I got 3-4 scam/spam calls and I kept them on the line for a good 10-15 minutes. Every one was a free trip to Mexico. At the end, I would say (after the first time) "this is the Nth time you called me to day" and the people would actually argue with me that it was the first. Now, when I see an unknown number, I just send it to voicemail.