cellular internet acces question.

I was talking to sprint the other day looking into internet access. The phone as modem sounds best for me.
I was looking at the brochure for broadband access and they only list a few cities. Does that mean I could only use it there or can I use it anywhere and those cities have better sevice or what? any of you with sprint able to fill me in?
I should have asked them but I didn't think of it untill later.
Also is sprint the better service as far as coverage and price etc?