When I was using iSync on Tiger for the first time, I was impressed by its small, cute interface and especially its phone icon just for the exact model of my mobile. This may sound a bit too much fuss, but as a Windows user who was used to see the same generic icon for all related devices, it could be a little surprised. :)
Unfortunately, most recent Nokia phones are not directly supported by iSync even your Mac OS X is fully updated and even the OS is Snow Leopard. You may connect your Nokia phone with your Mac via Bluetooth and exchange files very well, but you just cannot synchronise the contacts and calendar between your Mac and Nokia phone.
To address this issue, Nokia has released related plugins to work with iSync for Mac OS X. Simply download and install the plugin for your phone and let the iSync go.
The compatible phones are Nokia C5, E50, E51, E52, E55, E60, E61i, E63, E65, E66, E70, E71, E71x, E72, E75, E90 Communicator, N75, N76, N77, N78, N79, N81, N82, N85, N86 8MP, N900, N93i, N95, N95 8GB, N96, N97, N97 mini, X86, 5230, 5232, 5233, 5235, 5320 XpressMusic, 5330 XpressMusic, 5630 XpressMusic, 5700 XpressMusic, 5730 XpressMusic, 5800 XpressMusic, 6110 Navigator, 6120 classic, 6121 classic, 6210 Navigator, 6220 classic, 6290, 6700 slide, 6702 slide, 6720 classic, 6730 classic, 6760 slide, and 6790 Surge.
Make sure you choose the right model otherwise you won't see its icon for your mobile.