This number has been calling me almost every other day for the past two months. Since I don't recognize the number, I waited for the caller to leave a message. But he/she never leave any message. I tried to call him/her back. But the automated system says, "Mailbox, can not be found".

Received 2 calls in a row from this # today. Both times I answered and said "Hello" 3 times before the caller hung up. I called the # back about an hour later and it says "Mailbox can not be found"

We receive 2 calls a day from this number, everyday.  I hear nothing for about 30 seconds and then the call is disconnected.  When I call the number back, the message (as shared in other posts) states "Mailbox can not be found."