Fring released an early test version of its client for the Apple iPhone. This application brings to iPhone users the ability to use Skype out, SIP and Google Talk for a true VoIP experience. Prices depend on the service you choose. The application supports multiple IM clients such as Skype, ICQ, Twitter and MSN Messenger. The good news is that it is totally free to download and use. The final version will be released soon.
Visit the source for information on how to actually install the application.