nokia phones

Just discovered http://www.fring.com/
It allows you to use the various large VOIP providers like skype , google talk, msn and its own user base at http://fring.com on Symbian mobile phones using a data connection rather than a GSM connection.
This allows you to make VOIP calls to your friends on MSN, or you can use a service like SkypeOut to make interational calls without paying an exorbitant per minute rate.