I was disappointed to see that the new Nokia 6086 under iSync. Knowing that it's probably the same BT protocol as every other Nokia out there I decided to go digging.

Well...it works with a simple text edit.

sudo vi /Applications/iSync.app/Contents/PlugIns/ApplePhoneConduit.syncdevice/Contents/PlugIns/PhoneModelsSync.phoneplugin/Contents/Resources/MetaClasses.plist

Add this block somewhere.. I added it right after the 6021 entry.

Code:
        <key>com.nokia.6086</key>
        <dict>          
                <key>Identification</key>
                <dict>
                        <key>com.apple.cgmi+cgmm</key>
                        <string>Nokia+Nokia 6086</string>
                        <key>com.apple.gmi+gmm</key>
                        <string>Nokia+Nokia 6086</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>NOK6021.tiff</string>
                                        <key>ModelName</key>
                                        <string>6086</string>
                                </dict>
                        </dict>
                        <dict>
                                <key>ServiceName</key> 
                                <string>com.apple.synchro</string>
                                <key>ServiceProperties</key>
                                <dict>
                                        <key>MaxEMailLength</key>
                                        <integer>126</integer>
                                        <key>MaxNotesLength</key>
                                        <integer>126</integer>
                                        <key>MaxURLLength</key>
                                        <integer>126</integer>
                                </dict>
                        </dict>
                </array>
        </dict>

This can probably be extended to most any new and unsupported Nokia that based on either the S40 or S60 style phone.