Calling cards iPhone application
<p>I am newbie to iPhone development, I want to do a kind of POC which fulfill the following requirement.</p>

<p>It will be basically a calling card application where user will enter a toll free number followed by pin number. After entering a pin no. it will show the available contacts from the iPhone itself, user will select a desired destination number and call it.</p>

<p>I know this is a whole new native application, but can anyone guide me how I can start working on the same. I have collected a few information about what calling card is and how it works. I'm a bit confused about how can I get the information from calling cards service provider?. Do i need to call there API and how to do a code in the XCODE tool?</p>

<p>Please help me in this regard.</p>
