If you are looking to tether to your G4 by Bluetooth with the TMO curve 8320 please do not purchase the phone if these are your intentions.

I have a TMO 8320 and a MacBook running 10.4 and I am not able to connect using the Curve and my Macbook. If you are looking for a phone that will allow you to tether your G4 and use the data plan try looking at the 8700g or the 8800, I have both and they work with the modem scripts provided by GGoodall. Both of these phones will allow you to use the BT tether option.

If you run Boot Camp or VMFuzion or some other application that will let you run windows on a different partition you can still connect to the internet by Desktop Manager. I hope this helps you with your decision but please dont buy the TMO Curve as this does not work via Bluetooth.