From Forum Nokia Wiki

iSkoot is free software for your cell phone that allows you to access the iSkoot network so that you can talk with your online buddies over the Internet anywhere you go. With iSkoot software you can take advantage of Internet telephony services without being tethered to your PC. iSkoot loads your Skype™ contact list right on your cell phone display screen, and with just a quick click of a button, you can call your contacts. All you pay for is air time on your mobile phone. You can also make international calls without paying those hefty long distance fees – Internet telephony charges will apply. Talk to anyone around the world for just a few cents a minute: from your cell phone!

http://www.iskoot.com/