Skype has just released the first beta version of its VoIP client for Symbian. It has almost all features that version for desktop computers have. Skype for Symbian supports free Skype-to-Skype calls, SkypeOut calls, instant messaging, group conversation, files exchange and etc. Unfortunately not all Symbian devices are compatible with new Skype. It supports smartphones that run on Symbian S60 3rd Edition Feature Pack 1 and Feature Pack 2. But next versions are planned to be compatible with more phones. You can find the list of supported devices here. As for usage notes Skype is recommended to install to the phone memory.