UK STD Dialing Codes - you miss a call, you dial 1471 - you're told the number is 01xxx, but where the heck is that number based? This tool will give you the answer.
DialABC - phone-number-to-keypad-mnemonic converter takes your phone number and shows a table with all the possible dictionary matches, including some fuzzy phonetic matches.
Fone Finder - identifies the city associated with a specific area code and prefix. Also identifies international country codes and the geographical location of the telephone.
Payphone Project - features a list of payphone numbers in the United States and Canada.