I didn't answer, since I didn't recognize the number. They left no message, I called the number back, and the person answered "Hello?", so, no business name!! He was from the middle east, and he asked, "Is this Lisa, from _____?" and gave the state I reside in. I asked if I could help him, he began to say, "You are not registered.....", so, I hung up. I blocked his number, and he tried to call back, but my phone rejected him.  Because of calls like this, you can never trust the person on the other line, until you prove who they are!!