The recent version of the Vippie softphone for Symbian supports chat and presence services over XMPP protocol. XMPP is becoming a standard for IM and is used by service like Google Talk and Facebook.  Also as a part of Voipswitch solution we deliver an XMPP server which combined with our Vippie clients and web portal/PBX supporting XMPP allows users to chat with each other, see other users presence status and also send files.  Now this functionality is available also for mobile users on Symbian smartphones.