I recently got a new phone, a Sony Ericsson T637. The phone is small, has some good features, including a crappy camera and, most importantly, Bluetooth. It had been a few months since I'd had a phone with Bluetooth, so I hadn't used iSync to sync my phone and Address Book contacts for a while. I added the phone as an iSync device and clicked "Sync Now" but I couldn't get syncing to work. It had worked flawlessly on my old T68i. Now it would sometimes sync "All Contacts" and sometimes not and it would never sync a group. I've got over 2000 cards in my Address Book, so All Contacts was not a good way to go--the phone ran out of memory and I ended up with too many contacts in the phone for the primitive navigation features it provides. So I've been trying various things for the last few days, but this morning I solved it. The solution was to completely reinstall iSync. Here's how I did it:

• Delete "iSync*" from /Library/Receipts/
• Delete the iSync application from /Applications/
• Delete "com.apple.isync.*" from ~Library/Preferences/
• Delete /Library/Application Support/SyncService/
• Delete ~/Library/Application Support/SyncService/
• Delete /Library/Receipts/iSync_Palm.pkg (I'm not using this anymore)
• Delete Ê/Library/Application Support/Palm HotSync/Conduits/Apple Ê

Then I downloaded iSync 1.4 again from Apple and reinstalled it. After adding my phone as a device in iSync, everything worked like a charm.