hello hows it going. i have the 8703e and a friend of mine has a 7130e follow this link [User] HOWTO: Use BlackBerry As Modem For Laptop!
All the settings are the same is if your were a Verizon customer. the user name is (xxx)firstname.lastname@example.org
and password is (xxx)xxx-xxxx
dont not enter the paranthesis or dashes.
Hope this works for you as it does for me. Also us cellular doesnt have a way to track whether the unit is used as a modem so they should never know
Any Questions feel free to get a hold of me.