While you can append 1800 numbers, pauses etc yourself ... it is a better idea to use one of the iPhone calling card applications.

The best one is CardCaller - a native iPhone application for the iPhone that allows you to add, and manage multiple Calling Cards and the 1-800 numbers, PIN, Dial Settings for them. This Application resembles the Phone application in design, and functionality and offers you the ability to manage Favorites, Recents, etc.

Here is more information about this application:
http://www.callingcard.marigoholdings.com/

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