Yeah, Apple announced that they will allow developers to make VoIP applications for the iPhone, but they quick to apply the Wi-Fi only clause to it.  Thank God for the guys at Fring who have been known to make VoIP available on almost every mobile/smart phone out now.

This works with jail-broken iPhones only and is still considered as a preview of the final version so you might hit a few snags along the way. The good thing about Fring’s iPhone VoIP is that it won’t limit you to Wi-Fi connections, but will also work via EDGE. Once a 3G iPhone comes out this year, I’m pretty sure that a new version from Fring will be released as well which will support 3G connectivity for faster data transmissions. Best of all, it’s free. Installation instructions are likewise available for those who are still clueless on how to install apps on their iPhone.

I’ve used Fring on a variety of S60 and Windows Mobile-running smartphones, and I have to admit, it’s a nifty application to have so you’ll always be connected to your IM buddies.