Free WiFiMobile VOIP client for Nokia S60 phones

Description from their site:

"WiFiMobile Service

WiFiMobile are proud to announce the launch of our mobile VOIP service where users can call each other for free literally anywhere in the world.
The service is available by simply downloading a free piece of software to your Nokia Nseries or Eseries. Simply enter your mobile number and we will automatically send you a text which you save to your handset. It’s as easy as downloading a ringtone.
With the free software successfully installed you are free to call other WiFiMobile and VOIP users completely free of charge over a wireless LAN network, such as in the home, office or a Wi-Fi hotspot. These hotspots are now very commonplace in such establishments as hotels, airports, railway stations, public houses, restaurants, coffee shops etc.
Very low cost calls can also be made to ordinary landlines and other mobile phones. For these types of calls you do not have to be in range of a Wi-Fi zone or hotspot but you will need 3G coverage.
We have made this application very user friendly and have even included a free “Buddy List” so you can see who is online at any time. Simply scroll to the user, press the green button on your phone and speak happily for as long as you want without spending a penny.
To use any of these services all you require is one of the ever growing list of popular Nokia Nseries or Eseries. Most of these are Wi-Fi enabled meaning that you can utilise the free calls. To see if your current handset is compatible please see our FAQs."

I wonder if this is any better than fring.

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