Using Skype for iPhone, users with an iPhone, or second generation iPod touch with a compatible headset and microphone, can make free Skype-to-Skype calls over Wi-Fi to other Skype users worldwide; have the ability to call landlines or mobile phone numbers (Skype calling rates apply); send and receive instant messages; receive calls to a personal online number on Skype; and see when your Skype contacts are online.

Scott Durchslag, Skype’s Chief Operating Officer, said that Skype for iPhone provides the same simplicity that the desktop app provides to its users.

Skype for iPhone will be a free download from the App Store.

[Updated at 7:16AM pacific to correct the availability to Tuesday.]