From William Habdas:
Ever wonder who the heck is calling you? Now you can find out. Use Area Code Search to quickly type in the 3 digit area code and find out where the call is from. Covers North America, including the US, Canada, Caribbean, and US territories.It will tell you if it is landline or a cellphone. It will tell you what phone company it is from. It even uses smart statistics to determine the highest likelihood the coordinates are accurate. Even better, you will instantly see maps showing you exactly where that is, and how far it is from your current position.