How to find out where a call is coming from?

This is going to sound crazy, i got a call on my iphone from a number that was only 5 digets and it said unknown under it no place where its coming from like it usually says when i get a call from the wrong number. I picked up but i didn't say hello, i heard a loud beeping, then a voice that was very raspy and cracking i couldnt tell if it was a man or a women but it seriously sounded like a demon or something. It sounded like it said "there are hundreds" and something else then hung up. I never said anything to them. It might of been a prank call but the number doesn't seem like a valid one it was only 5 digets long (ex 000-00) i want to know where the call is coming from i'm seriously a little freaked out from the weird message it said… Is there a website i can type the number in and find out the area its coming from?

You don't it was a spoofed number. If the call was THREATENING you can hangup and then dial *57 and the call will be traced and the real number will shown on the trace but only the telephone company will have access to the trace information and will only disclose it to the police. So you will need to contact the police about the calls. Again they will only get involved if the call is THREATENING.