Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/120)

As there are certain restrictions in place on our corporate network and ISA server, I would like to somehow force my BB to use my provider's APN.

I have the details and despite entering them into Advanced Settings the BB continues to connect via our BES. Is there a known way to achieve this?

In the settings look for Browser. In there set default browser and default MDS browser to your carrier. Then, most software will have options also.

Make sure your company did not disable this feature with the policy also,