Once in awhile I want to post a useful tool that I have stumbled across surfing the internet. Today I’d like to share Whocalled.us. Have you ever looked at your caller id to see an 800 number or another number you don’t recognize? Pop the number into Whocalled.us ‘s database, and see if someone else has been called by the same party. You can also add numbers for parties that you have found the identity of, to help others in the fight against unwanted phone calls.