Following in others' footsteps, I played around and got my new Nokia 6103 from T-Mobile to sync with iSync. As in the previous hint, navigate into the iSync package (control-click, Show Package Contents, then drill down to Contents -> PlugIns -> ApplePhoneConduit.syncdevice -> Contents -> PlugIns -> PhoneModelsSync.phoneplugin -> Contents -> Resources), and then edit the MetaClasses.plist file.Begin code:
<key>com.nokia.6103</key>
<dict>
<key>Identification</key>
<dict>
<key>com.apple.cgmi+cgmm</key>
<string>Nokia+Nokia 6103</string>
</dict>
<key>InheritsFrom</key>
<array>
<string>family.com.nokia.series40.bus.bt</string>
</array>
<key>Services</key>
<array>
<dict>
<key>ServiceName</key>
<string>com.apple.model</string>
<key>ServiceProperties</key>
<dict>
<key>ModelIcon</key>
<string>NOK6103.tiff</string>
<key>ModelName</key>
<string>6103</string>
</dict>
</dict>
</array>
</dict>
This worked for contacts, though I haven't tried calendars yet.

