Who called from 3010000000

i received unknown call from +301 and can not find out whose number is this

i received unknown call from +301 and can not find out whose number is this

i received unknown call from +301 and can not find out whose number this

i get a call from +301 nothing else, no other numbers, just the 3 digits on 23rd December 2012.pls help me what number is this. I do not answer.

Do you have Caller ID? This is your first line of defense. If you see a name and/or number (or no number) that you recognize, do not pick up the call! If you do pick up, hang up immediately. If you should hear the message, and it tells you to press a button, hang up immediately. Then report the call to 800notes and the FCC DNC complaint site. The fewer calls you pick up, them more the robo-callers will think that your number is not a working number (I read that right here on 800notes.)