I have a Cingular 2125 (no longer sold) and have the Smartphone Connect Unlimited Data plan; I pay $20 a month for it. I've dropped my cable internet and just use my phone for my internet connection. It's a little slow (right at 200 kbps on the EDGE network), but I don't really want to pay $60 a month for cable internet (smaller cable company that requires basic cable service). You can do the same for the BlackJack. The "Internet Sharing" capabilities are built into the phone, but not into the interface.
Yeah I do that with my Sprint Treo 700wx using it as a modem when I need internet connection. The highest I get 234. And I pay 15 dollars a month.
Not sure if you're aware, but doing that without the Laptop Connect plan is breaking the Cingular terms of service. Its considered tethering and Cingular has the right to retroactivley charge you for your use.
