S60 smartphones support VoIP functionality and three applications that demonstrate this technology are Fring, Gizmo Project, and Truphone.
A list of contacts appear on the Nokia N80ie
The contact service is shown with the top icons.
You can make Skype Out calls using this menu.
Placing a Skype call using Fring.
Placing a call using the Google Talk service
Using the E61 to change settings
You can use instant messaging with Skype, Google, and MSN with Fring.
Contact list on the Nokia E61
You can have multiple VoIP clients setup on your device.
Setting up the specific details of Truphone on the N80ie.
Not all S60 devices have SIP settings and some are limited.