Not all phones are created equal, especially when it comes to finding device drivers for the Macintosh. If you’re running a Sony Ericsson or Nokia phone you may have an easier time finding licensed plugins to sync your phone with Apple’s iSync app.
If you’re on a Nokia, all you need to do is head on over to their corporate website and download the appropriate device driver that unpacks to iSync depending on your phone’s brand. It’s really easy to install. If the phone isn’t listed, you will need to wait a few days. Nokia always releases a new update whenever a new phone is released.
However if you own other brands and want to use a third party sync tool, you can check out Mactomster. This iSync plugin also supports a number of S40 phones from Nokia. Here is a list of devices they support, taken from their site: