Skype iPhone app helps you to reach your contacts anywhere in the world and without being restricted to the availability of Wi-Fi network. The service is available at great rates with Skype. You can call and text (SMS) phones with Pay As You Go credit or with a subscription you get unlimited calls² to landlines (and mobiles in some countries).
Moreover, Skype-to-Skype calling on 3G is free and to phones abroad on WiFi or 3G at low cost until at least the end of August 2010, after that there'll be a small monthly free.
Regarding Apple iPad, the consumers can use the Skype iPhone app, but it may cause some problems concerning interface and space usage as the app needs a lot of space in some cases. Unfortunately not all the iPhone apps run on iPad, but the developers started working on this stuff and soon iPad users can have the Skype app for iPad and it will hit the app store pretty soon.
The application is available from the App Store and is compatible with the iPhone, iPhone 3G, iPhone 3GS, iPod touch and the iPad. Skype requires the iPhone operating system version 3.0 or above.