Optimal Port speed and modem speed for Bluetooth modem ?

[varunmehta11]

I have installed a Bluetooth connection between my desktop and my Nokia N73 cellphone using a Mni USB Bluetooth Dongle. Now since i want to use my cellphone(EDGE data connection) as a bluetooth modem so i configured it as a Dial-up modem. Now what would be the optimal Maximum Port speed and Modem speed for the best possible internet speed. The maximum speed can be set in both is 921600 (921.6 Kbps). Should i set them to 921.6 Kbps ?