VOIP in your cell phone via wifi and 3G

Here I'll show you application for your cell phone called Fring. It's really great, free and easy to use.
What can we do with Fring;
-Voice calls via Skype
- chatting (Skype, MSN, ICQ)
- Voice calls via any SIP provider, so you can call regular numbers
- using addons such last.fm, gmail and others
What we need:
Cell phone with wifi and/or 3G connetion,( unlimited data plan is great) :)
New nokia phones with Symbian os, or Windows Mobile are best, It works on Iphone too, list of devices you can find on http://www.fring.com/