I like Area Code Finder because it includes the map of the area code and also the time zone so you can pinpoint the necessary information for your call. Area code descriptions are for the U.S., Canada, Caribbean and U.S. Territories. Future enhancements will include many great options.
"This app allows you to quickly do a lookup on unknown area codes. Tap in the 3 digit code to get the area code description. Plus get a map that shows you where the area code is located. The map shows the time zone borders also. This lets you figure out the best time to call."
--Tip: Some hints on usage-tap the green numeric screen if you want to clear a number you mistyped. Overlay means the same area shares one or more area codes.
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Visit the iTunes App Store for more details, and to download: