I use my BB8700c as a laptop-modem. It's quite fast. No extra-charges, it comes out of the BB-data-plan. I had Martin Trautschold from Blackberry made simple help me to set it up. Works fine and I saved a lot of money, don't need a wireless laptop modem now for 80 bucks a month.

Here is Martins contact-information, call or email him and say Horst sent you to configure the BB as modem:
BlackBerryMadeSimple.com : The Best BlackBerry Learning Tools - Video Tutorials, Custom Videos, Books and Training.

Simply the Best BlackBerry Learning Tools!

Video Tutorials, Custom Videos, Books & Training.

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Martin Trautschold

Video Producer, Author & Trainer

Office: 386-506-8224

Cell: 386-334-6434