Have you ever gotten a phone call with an unknown 1-800 number or some other possible telemarketer phone number?  Wish you could find out who it was without having to call them back?  Or tried calling them back to find out it doesn't call anyone?   A website called whocalled.us allows you to enter the phone number from Caller ID and see who else has had a call from that number and if anyone knows who it is.  Very useful for seeing who a constant unknown caller is.

http://whocalled.us

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