Fixed quote from this post:
http://discussions.europe.nokia.com/discussions/board/message?board.id=pcsuite&m essage.id=18480&view=bydateascending&page=3
Hi
+I managed to get iSync to work with my 6120 this way:+
+Download the plugin from
http://the.taoofmac.com/media/Nokia/6120/Nokia-6120c.phoneplugin.zip and unzip it.+
+Now find iSync, right/cntrl-click on it and select 'Show Package Contents'. Navigate to Contents > Plugins > ApplePhoneConduit.syncdevice > Contents > PlugIns and drop the 'Nokia-6120c.phoneplugin' folder into this
PlugIns folder.+
+Now unpair the mac from the phone (if you have already paired them) and re-setup the phone using Apple's bluetooth utility.+
+Start iSync and the phone should come up automatically. (Actually the iSync will start automatically, when you finish the pairing-process)+
+Although an error message came up on the phone after I synced my contacts, all contacts were synced successfully.+
+Hope this helps.+