They call, hold the phone to see if anyone is at home, and hang up! If they are doing this for the purpose of home invasion, we'll be waiting with the Police!
They called today 6 jul 2015 . He asked for me by my last name . I asked was he a magician to call from a phone with Id name not found .. A number which cannot be reached when dialed . He was indignant asking ,how can I be talking to you from a phone that is not real? I told him it was a spoofed number from a robo call . He said he was calling about the furnace at my address. I asked him who told him I had a furnace. He hung up. These people call 1..to find out if anyone is home., for burglary vs home invasion. 2 ..to sell worthless duct cleaning services . 3. to gather information to sell to other telemarketers .He said his name was Ron Tyler .
Received call from this number, they asked for us by name, but mumbled something about '??? air' that needed cleaning. I said what did you say? and they hung up. I will block them for sure.