Do you have PAM on your account?
I'm not sure but Sprint might disallow blackberries without PAM to connect that way.
Looks like everything worked, just no data connection. You even got ip address and all.
Hmm did you test connection? The program will run forever till you press CTRL-c. Meanwhile the connection should work.
"There is no reason anyone would want a computer in their home."
- Ken Olson, 1977
( And we now wear them! Blackberries are computers too! )