Do you know who called???? NEVER ANSWER IF YOU DON'T PERSONALLY KNOW THE CALLER. First-answering the phione tells the robo call computer that it just called a working phone number-and if you try to call an outbound call center-meaning that only calls from this center can call you-the computer again records your phone number as a "sucker" that is interested. They count on people wanting to know who and why they got a call. You just set yourself up for a lot of robo calls. Thats what voice mail is for. If there is no message that is also one of their tricks-they wnt you to TRY to call back. WATCH YOUR BANK ACCOUNT AND CREDIT CARDS.