I have a Blackjack, I am currently on the $20 MediaMax plan, which offers 200 text messages a month and "unlimited" data. I do occasionally use my BJ as a modem for my laptop and have yet to have any issue with them adding fees or kicking me upto the PDA connect. As far as I know there is only one known method of getting the 770 to pair with the Blackjack for internet and its a very long convoluted process. the issue is that the Blackjack uses PAN networking, while the 770 only supports DUN networking. Theres a thread that shows how to do it, if you search the forum you'll find it, but good luck, you'll need it to get it to work.