Sale has ended but you can still get this app.
Download Calling Codes Now

Official Description

"Calling Codes" is a small tool to find country codes before make a international call. It includes wikipedia buttons for more local information. Hope you will like it. Thanks.

(#)Please download our free version(full features) to evaluate before you purchase this application and see here (http://www.google.com/mobile/android/market-policies.html) for more details.