Even in 10.4.9, there's no support for the Sony Ericsson W300i. So just open
/Applications » iSync.app » Contents » PlugIns » ApplePhoneConduit.syncdevice » Contents » PlugIns » PhoneModelsSync.phoneplugin » Contents » Resources » MetaClasses.plist and insert the following lines:
<key>com.sony-ericsson.W300</key>
<dict>
<key>Identification</key>
<dict>
<key>com.apple.gmi+gmm</key>
<array>
<string>Sony Ericsson+Sony Ericsson W300</string>
<string>Sony Ericsson+Sony Ericsson W300i</string>
<string>Sony Ericsson+Sony Ericsson W300-1</string>
<string>Sony Ericsson+Sony Ericsson W300i-1</string>
</array>
<key>com.apple.gmi+gmm</key>
<array>
<string>Sony Ericsson+Sony Ericsson W300</string>
<string>Sony Ericsson+Sony Ericsson W300i</string>
<string>Sony Ericsson+Sony Ericsson W300-1</string>
<string>Sony Ericsson+Sony Ericsson W300i-1</string>
</array>
</dict>
<key>InheritsFrom</key>
<array>
<string>family.com.sony.ericsson.syncml-phones-2005.bt</string>
</array>
<key>Services</key>
<array>
<dict>
<key>ServiceName</key>
<string>com.apple.model</string>
<key>ServiceProperties</key>
<dict>
<key>ModelIcon</key>
<string>SEZ520.tiff</string>
<key>ModelName</key>
<string>W300</string>
</dict>
</dict>
</array>
</dict>[robg adds: These are basic instructions; try this search if you'd like to see many other examples, some of which may provide more detail.]
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