nanpa.com regularly updates all area codes in US with the map. Very handy for looking for location of a phone number, Image courtesy – Nanpa
For US phone numbers : This is the age of telemarketers and they will call you no matter you register in “DO NOT CALL REGISTRY” or un list your number from your phone company directory. Many times its a missed call with no voice mails. 800notes is the best site to get info on those strange numbers. Just plug in that missed call number and read the other users comments. To find the caller and the location, Nanpa website – gives you area codes and location.
The North American Numbering Plan (NANP) is an integrated telephone numbering plan serving 19 North American countries that share its resources. These countries include the United States and its territories, Canada,Bermuda, Anguilla, Antigua & Barbuda, the Bahamas, Barbados, the British Virgin Islands, the Cayman Islands,Dominica, the Dominican Republic, Grenada, Jamaica, Montserrat, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and Turks & Caicos.
If you are a map person then use Geolocator site
For India phone numbers:
To find out about all details about cell phone number , read this wiki article –
All cellphone numbers are 10 digits long, (normally) split up as OO-AA-NNNNNN where OO is the operator code, AA is the zone code assigned to the operator, and NNNNNN is the subscriber number.
For location by plugging in just the India cell phone number use this site