I have a Class 1 Belkin F8T001 plugged in to my G4 running 10.2.6 and can pair quite happily with my Nokia 6310i. Using v1.1.1 of PhoneManager - http://www.macmedia.sk/ - I can download and upload all my telephone numbers on either the phone or the card . I also have no problem in sending SMS messages from the G4. I also have a generic (unbranded) Class 1 Bluetooth adaptor which I use in an ADS USB Cardbus adaptor plugged into a WallStreet PowerBook. With this I can communicate and exchange files with the G4, and similarly, using PhoneManager, talk to the Nokia in the same way as described above. The Class 1 USB Blutooth adaptors have an extended range of up to 100m and configuration was simple and fast using the Bluetooth 1.2.1 update.