Download the script(text for 8700 - the one i gave u a link) here. Please Right-Click and Choose 'Save As'.
Copy the script into /Library/Modem Scripts.
If you've already paired your 8700 with your Mac, open Bluetooth Preferences, Select your 8700 from the list of devices and press 'Configure...'. (If you haven't, choose 'Set up Bluetooth Device' - the following dialogs will be shown after you've paired your phone with your Mac. Make sure your 8700 doesn't require a password for your mac to connect to it - the 'Trusted Connection' option for the pairing should be set to 'Yes' on your phone, not 'Ask'.)
Make sure 'Access the Internet with your phone's data connection' is checked. Also, make sure 'Use a direct, higher speed connection' is selected. Click Continue.
In the Modem Script pulldown on the following screen, Select 'BlackBerry 8700'. Use the following settings for the other fields, then click Continue:
Username, Password: leave blank
GPRS CID: *99***1#
Open the Internet Connect application. Select the Bluetooth icon at the top. Under Phone Number(*99), put your APN (for Cingular it's "wap.cingular"). Type a username and password (for Cingular you'll use "WAP@CINGULARGPRS.COM" as the username and "CINGULAR1" as the password) in the appropriate fields