Skype is set to launch its iPhone application March 31st  bringing its
much-anticipated Net-based phone service to Apple’s mobile platform.
With the Skype iPhone app, users will be able to make free calls using
Wi-Fi to other Skype users as well as use their Skype accounts to make
reduced price calls to traditional landline phones.

Skype announced its iPhone application [...]

iPhone, Skype, WiFi