First off, if your mac have Bluetooth, enable that. (Thats done in System Preferences -> Bluetooth -> Settings). That gives you a bluetooth icon in your menu-bar, left of the clock.
On your phone, enable Blutooth. On my v620 it's in Settings -> Connections -> Bluetooth. From your mac, press the Bluetooth icon, and select "Set up Bluetooth device".
This starts a guide, that searches for bluetooth-enabled devices, and it will find your phone. After you have discovered your phone, you must pair the devices so they 'know' each other. To do this, you must choose a pin-code that you press on both your mac and on your phone.
When this is done, you shoud be able to selecte "Browse device" from the bluetooth menu, select your phone and click 'Browse'. This opens a window, dispaying the content of your phone. There you can upload or download images, sounds and video to or from your phone.
It works like a charm with my combination - powerbook 12" and v620.
