You should check out this Knowledge Base Article and this one. I was having trouble syncing Address Book and the Nokia 3650 via bluetooth with iSync at first. Both devices saw the other and were paired, but every time I tried to sync I received an “Unable to establish connection” error. Turns out it was a firewall problem. Rather than entirely disabling my firewall, I followed the 2nd part of these instructions:
Turn off the personal firewall setting in System Preferences:
1. Choose Apple > System Preferences.
2. Choose View > Sharing.
3. Click the Firewall tab.
4. Click Stop to turn off the firewall.
Alternatively, configure the firewall settings in step 4 to open the port to the phone. Click New and enter these settings:
Port Name: Other
Port Number, Range or Series: 3004
Description: Bluetooth
Now it works like a charm…
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