they are looking for active phone# to call back at a later time to scam, so do not answer the phone. and if it is a scam were they leave a message on your service then you pick it up and hang up right away, that tells them they are unable to leave a message and not a active # and the security question they ask to make sure it is you!, do not answer, they called you! they should know who they are talking too. and it is usually is your birthday, if you give it you are half way there of them steeling your 'ID'. the best thing to do is not answer numbers you do dot know, if it is inportant they will call back or leave a message.

Same here wow ppl have a lot of time on their hands to call numbers and hang up

yeah same here called tonight and left no message