Had "unknown name" as caller ID. Left no message. The only other call I got all day was from AMSG which left a message that it was important that I call them back. It's a scam debt collector. I've been getting calls leaving the same message with IDs all over the country and within about two hours of these calls where AMSG leaves a message, I receive calls with various IDs that leave no message. I am sure they are all from the same scammer. No need to answer the phone or call back.