Called my house twice yesterday. Made mistake of answering second time (was expecting another call). Big mistake. There was silence - after I yelled "Hello?" several times, there was an eerie bleep and then a female robot said "Goodbye" and then it disconnected
I fear that this was a call to see if my number was valid. It's blocked now - but I doubt it will call again now that my number's probably been shared with other scammers.