Skype for Windows Mobile allows you to make free Skype-to-Skype calls using a 3G or WiFi connection.

Get Skype on your mobile phone here. Skype is even better...
Skype gives you free calls and instant messages to anyone else on Skype.

This mobile version of the Skype VOIP client also lets you call phones with Skype credits, as well as allowing you to receive calls on your online number, send instant messages, share files, and more.

Using Skype on your phone is dead easy. Once launched, the program gives you all sorts of warnings to notify you that it will be using your mobile Internet connection. Then it's just a case of signing in with your regular...

Download Skype Mobile here http://tinyurl.com/65n6pzm